Multi-TTI multi-MCS scheduling DCI transmission method and device

This application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2021/013383, filed on Sep. 29, 2021.

The present disclosure relates to a method and apparatus for multiple Transmission Time Interval (TTI) multiple Modulation and Coding Scheme (MCS) scheduling Downlink Control Information (DCI) transmission.

3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) is a technology for enabling high-speed packet communications. Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity. The 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement.

Work has started in International Telecommunication Union (ITU) and 3GPP to develop requirements and specifications for New Radio (NR) systems. 3GPP has to identify and develop the technology components needed for successfully standardizing the new RAT timely satisfying both the urgent market needs, and the more long-term requirements set forth by the ITU Radio communication sector (ITU-R) International Mobile Telecommunications (IMT)-2020 process. Further, the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future.

The NR targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced Mobile BroadBand (eMBB), massive Machine Type Communications (mMTC), Ultra-Reliable and Low Latency Communications (URLLC), etc. The NR shall be inherently forward compatible.

As wireless communication technologies and User Equipment (UE) technologies evolve, there is an increasing need to provide multiple services requiring different Quality of Service (QOS) from a single UE and/or to provide a single service consisting of features requiring different QoS. As an example of providing multiple services requiring different QoS on a single UE, a smartphone user may use a Social Networking Service (SNS) or browse the Internet while watching a video. An example of providing a single service consisting of features requiring different QoS is an AR/VR service that provides visual and auditory data, which require different data transmission rates and latencies. Meanwhile, the number of devices connecting to wireless communication networks is increasing rapidly as various types of devices, including autonomous vehicles as well as devices used directly by humans such as smartphones, require wireless communication capabilities. As a result, there is a growing need for wireless access technologies that can support multiple QoS transmissions to multiple UEs.

In a transmission method that schedules one Physical Uplink Shared channel (PUSCH) with one Downlink Control Information (DCI), the transmission rate of Uplink (UL) data may be degraded. Therefore, multiple Transmission Time Interval (TTI) scheduling, which can schedule multiple PUSCHs with one DCI, may be applied.

The present disclosure provides a method and apparatus for efficiently providing multiple services requiring different QoS and/or a service comprising multiple data streams requiring different QoS within a UE when multiple TTI scheduling is applied.

In an aspect, a method performed by a User Equipment (UE) in a wireless communication system is provided. The method comprises receiving one downlink control information from a network over a downlink control channel. The one downlink control information schedules both a first shared channel and a second shared channel, and the one downlink control information comprises a reference Modulation and Coding Scheme (MCS) index and a first offset value for the reference MCS index. The method comprises communicating with the network over the first shared channel to which a first MCS index is applied. The first MCS index is based on the reference MCS index. The method comprises, after communicating with the network over the first shared channel, communicating with the network over the second shared channel to which a second MCS index greater than the first MCS index is applied. The second MCS index is based on the reference MCS index and the first offset value.

In another aspect, a method performed by a base station in a wireless communication system is provided. The method comprises transmitting one downlink control information to the UE over a downlink control channel. The one downlink control information schedules both a first shared channel and a second shared channel, and the one downlink control information comprises a reference Modulation and Coding Scheme (MCS) index and a first offset value for the reference MCS index. The method comprises communicating with the UE over the first shared channel to which a first MCS index is applied. The first MCS index is based on the reference MCS index. The method comprises, after communicating with the UE over the first shared channel, communicating with the UE over the second shared channel to which a second MCS index greater than the first MCS index is applied. The second MCS index is based on the reference MCS index and the first offset value.

In another aspect, an apparatus implementing the above method is provided.

The present disclosure can have various advantageous effects.

For example, in multiple TTI scheduling, where multiple PXSCHs are scheduled with a single DCI, data can be transmitted using different MCSs for each PXSCH while minimizing the increase in size of the DCI.

For example, when multiple data streams with different target BLERs are scheduled with one DCI and transmitted, the frequency transmission efficiency can be increased and the power consumption of the UE can be lowered while satisfying the data stream-specific QoS.

Advantageous effects which can be obtained through specific embodiments of the present disclosure are not limited to the advantageous effects listed above. For example, there may be a variety of technical effects that a person having ordinary skill in the related art can understand and/or derive from the present disclosure. Accordingly, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that may be understood or derived from the technical features of the present disclosure.

The following techniques, apparatuses, and systems may be applied to a variety of wireless multiple access systems. Examples of the multiple access systems include a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, a Single Carrier Frequency Division Multiple Access (SC-FDMA) system, and a Multi Carrier Frequency Division Multiple Access (MC-FDMA) system. CDMA may be embodied through radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be embodied through radio technology such as Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), or Enhanced Data rates for GSM Evolution (EDGE). OFDMA may be embodied through radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or Evolved UTRA (E-UTRA). UTRA is a part of a Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE employs OFDMA in downlink (DL) and SC-FDMA in uplink (UL). Evolution of 3GPP LTE includes LTE-Advanced (LTE-A), LTE-A Pro, and/or 5G New Radio (NR).

For convenience of description, implementations of the present disclosure are mainly described in regards to a 3GPP based wireless communication system. However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to a 3GPP based wireless communication system, aspects of the present disclosure that are not limited to 3GPP based wireless communication system are applicable to other mobile communication systems.

For terms and technologies which are not specifically described among the terms of and technologies employed in the present disclosure, the wireless communication standard documents published before the present disclosure may be referenced.

In the present disclosure, “A or B” may mean “only A”, “only B”, or “both A and B”. In other words, “A or B” in the present disclosure may be interpreted as “A and/or B”. For example, “A, B or C” in the present disclosure may mean “only A”, “only B”, “only C”, or “any combination of A, B and C”.

In the present disclosure, slash (/) or comma (,) may mean “and/or”. For example, “A/B” may mean “A and/or B”. Accordingly, “A/B” may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C” may mean “A, B or C”.

In the present disclosure, “at least one of A and B” may mean “only A”, “only B” or “both A and B”. In addition, the expression “at least one of A or B” or “at least one of A and/or B” in the present disclosure may be interpreted as same as “at least one of A and B”.

In addition, in the present disclosure, “at least one of A, B and C” may mean “only A”, “only B”, “only C”, or “any combination of A, B and C”. In addition, “at least one of A, B or C” or “at least one of A, B and/or C” may mean “at least one of A, B and C”.

Also, parentheses used in the present disclosure may mean “for example”. In detail, when it is shown as “control information (PDCCH)”, “PDCCH” may be proposed as an example of “control information”. In other words, “control information” in the present disclosure is not limited to “PDCCH”, and “PDCCH” may be proposed as an example of “control information”. In addition, even when shown as “control information (i.e., PDCCH)”, “PDCCH” may be proposed as an example of “control information”.

Technical features that are separately described in one drawing in the present disclosure may be implemented separately or simultaneously.

Although not limited thereto, various descriptions, functions, procedures, suggestions, methods and/or operational flowcharts of the present disclosure disclosed herein can be applied to various fields requiring wireless communication and/or connection (e.g., 5G) between devices.

Hereinafter, the present disclosure will be described in more detail with reference to drawings. The same reference numerals in the following drawings and/or descriptions may refer to the same and/or corresponding hardware blocks, software blocks, and/or functional blocks unless otherwise indicated.

1 FIG. shows an example of a communication system to which implementations of the present disclosure are applied.

1 FIG. 1 FIG. The 5G usage scenarios shown inare only exemplary, and the technical features of the present disclosure can be applied to other 5G usage scenarios which are not shown in.

Three main requirement categories for 5G include (1) a category of enhanced Mobile BroadBand (eMBB), (2) a category of massive Machine Type Communication (mMTC), and (3) a category of Ultra-Reliable and Low Latency Communications (URLLC).

1 FIG. 1 FIG. 1 100 100 200 300 1 a f Referring to, the communication systemincludes wireless devicesto, Base Stations (BSs), and a network. Althoughillustrates a 5G network as an example of the network of the communication system, the implementations of the present disclosure are not limited to the 5G system, and can be applied to the future communication system beyond the 5G system.

200 300 The BSsand the networkmay be implemented as wireless devices and a specific wireless device may operate as a BS/network node with respect to other wireless devices.

100 100 100 100 100 100 1 100 2 100 100 100 100 400 a f a f a b b c d e f The wireless devicestorepresent devices performing communication using Radio Access Technology (RAT) (e.g., 5G NR or LTE) and may be referred to as communication/radio/5G devices. The wireless devicestomay include, without being limited to, a robot, vehicles-and-, an extended Reality (XR) device, a hand-held device, a home appliance, an Internet-of-Things (IoT) device, and an Artificial Intelligence (AI) device/server. For example, the vehicles may include a vehicle having a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles. The vehicles may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) device and may be implemented in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), and a computer (e.g., a notebook). The home appliance may include a TV, a refrigerator, and a washing machine. The IoT device may include a sensor and a smartmeter.

100 100 a f In the present disclosure, the wireless devicestomay be called User Equipments (UEs). A UE may include, for example, a cellular phone, a smartphone, a laptop computer, a digital broadcast terminal, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), a navigation system, a slate Personal Computer (PC), a tablet PC, an ultrabook, a vehicle, a vehicle having an autonomous traveling function, a connected car, an UAV, an AI module, a robot, an AR device, a VR device, an MR device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a FinTech device (or a financial device), a security device, a weather/environment device, a device related to a 5G service, or a device related to a fourth industrial revolution field.

The UAV may be, for example, an aircraft aviated by a wireless control signal without a human being onboard.

The VR device may include, for example, a device for implementing an object or a background of the virtual world. The AR device may include, for example, a device implemented by connecting an object or a background of the virtual world to an object or a background of the real world. The MR device may include, for example, a device implemented by merging an object or a background of the virtual world into an object or a background of the real world. The hologram device may include, for example, a device for implementing a stereoscopic image of 360 degrees by recording and reproducing stereoscopic information, using an interference phenomenon of light generated when two laser lights called holography meet.

The public safety device may include, for example, an image relay device or an image device that is wearable on the body of a user.

The MTC device and the IoT device may be, for example, devices that do not require direct human intervention or manipulation. For example, the MTC device and the IoT device may include smartmeters, vending machines, thermometers, smartbulbs, door locks, or various sensors.

The medical device may be, for example, a device used for the purpose of diagnosing, treating, relieving, curing, or preventing disease. For example, the medical device may be a device used for the purpose of diagnosing, treating, relieving, or correcting injury or impairment. For example, the medical device may be a device used for the purpose of inspecting, replacing, or modifying a structure or a function. For example, the medical device may be a device used for the purpose of adjusting pregnancy. For example, the medical device may include a device for treatment, a device for operation, a device for (in vitro) diagnosis, a hearing aid, or a device for procedure.

The security device may be, for example, a device installed to prevent a danger that may arise and to maintain safety. For example, the security device may be a camera, a Closed-Circuit TV (CCTV), a recorder, or a black box.

The FinTech device may be, for example, a device capable of providing a financial service such as mobile payment. For example, the FinTech device may include a payment device or a Point of Sales (POS) system.

The weather/environment device may include, for example, a device for monitoring or predicting a weather/environment.

100 100 300 200 100 100 100 100 400 300 300 100 100 200 300 100 100 200 300 100 1 100 2 100 100 a f a f a f a f a f b b a f. The wireless devicestomay be connected to the networkvia the BSs. An AI technology may be applied to the wireless devicestoand the wireless devicestomay be connected to the AI servervia the network. The networkmay be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, and a beyond-5G network. Although the wireless devicestomay communicate with each other through the BSs/network, the wireless devicestomay perform direct communication (e.g., sidelink communication) with each other without passing through the BSs/network. For example, the vehicles-and-may perform direct communication (e.g., Vehicle-to-Vehicle (V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devicesto

150 150 150 100 100 100 100 200 200 150 150 150 100 100 200 100 100 150 150 150 150 150 150 a b c a f a f a b c a f a f a b c a b c Wireless communication/connections,andmay be established between the wireless devicestoand/or between wireless devicetoand BSand/or between BSs. Herein, the wireless communication/connections may be established through various RATs (e.g., 5G NR) such as uplink/downlink communication, sidelink communication (or Device-to-Device (D2D) communication), inter-base station communication(e.g., relay, Integrated Access and Backhaul (IAB)), etc. The wireless devicestoand the BSs/the wireless devicestomay transmit/receive radio signals to/from each other through the wireless communication/connections,and. For example, the wireless communication/connections,andmay transmit/receive signals through various physical channels. To this end, at least a part of various configuration information configuring processes, various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/de-mapping), and resource allocating processes, for transmitting/receiving radio signals, may be performed based on the various proposals of the present disclosure.

AI refers to the field of studying artificial intelligence or the methodology that can create it, and machine learning refers to the field of defining various problems addressed in the field of AI and the field of methodology to solve them. Machine learning is also defined as an algorithm that increases the performance of a task through steady experience on a task.

Robot means a machine that automatically processes or operates a given task by its own ability. In particular, robots with the ability to recognize the environment and make self-determination to perform actions can be called intelligent robots. Robots can be classified as industrial, medical, home, military, etc., depending on the purpose or area of use. The robot can perform a variety of physical operations, such as moving the robot joints with actuators or motors. The movable robot also includes wheels, brakes, propellers, etc., on the drive, allowing it to drive on the ground or fly in the air.

Autonomous driving means a technology that drives on its own, and autonomous vehicles mean vehicles that drive without user's control or with minimal user's control. For example, autonomous driving may include maintaining lanes in motion, automatically adjusting speed such as adaptive cruise control, automatic driving along a set route, and automatically setting a route when a destination is set. The vehicle covers vehicles equipped with internal combustion engines, hybrid vehicles equipped with internal combustion engines and electric motors, and electric vehicles equipped with electric motors, and may include trains, motorcycles, etc., as well as cars. Autonomous vehicles can be seen as robots with autonomous driving functions.

Extended reality is collectively referred to as VR, AR, and MR. VR technology provides objects and backgrounds of real world only through Computer Graphic (CG) images. AR technology provides a virtual CG image on top of a real object image. MR technology is a CG technology that combines and combines virtual objects into the real world. MR technology is similar to AR technology in that they show real and virtual objects together. However, there is a difference in that in AR technology, virtual objects are used as complementary forms to real objects, while in MR technology, virtual objects and real objects are used as equal personalities.

NR supports multiples numerologies (and/or multiple Sub-Carrier Spacings (SCS)) to support various 5G services. For example, if SCS is 15 kHz, wide area can be supported in traditional cellular bands, and if SCS is 30 kHz/60 kHz, dense-urban, lower latency, and wider carrier bandwidth can be supported. If SCS is 60 kHz or higher, bandwidths greater than 24.25 GHz can be supported to overcome phase noise.

The NR frequency band may be defined as two types of frequency range, i.e., Frequency Range 1 (FR1) and Frequency Range 2 (FR2). The numerical value of the frequency range may be changed. For example, the frequency ranges of the two types (FR1 and FR2) may be as shown in Table 1 below. For ease of explanation, in the frequency ranges used in the NR system, FR1 may mean “sub 6 GHz range”, FR2 may mean “above 6 GHz range,” and may be referred to as millimeter Wave (mmW).

TABLE 1 Frequency Corresponding Subcarrier Range designation frequency range Spacing FR1  450 MHz-6000 MHz 15, 30, 60 kHz FR2 24250 MHz-52600 MHZ 60, 120, 240 kHz

As mentioned above, the numerical value of the frequency range of the NR system may be changed. For example, FR1 may include a frequency band of 410 MHz to 7125 MHz as shown in Table 2 below. That is, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more included in FR1 may include an unlicensed band. Unlicensed bands may be used for a variety of purposes, for example for communication for vehicles (e.g., autonomous driving).

TABLE 2 Frequency Corresponding Range designation frequency range Subcarrier Spacing FR1  410 MHz-7125 MHz 15, 30, 60 kHz FR2 24250 MHz-52600 MHz 60, 120, 240 kHz

Here, the radio communication technologies implemented in the wireless devices in the present disclosure may include NarrowBand IoT (NB-IoT) technology for low-power communication as well as LTE, NR and 6G. For example, NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology, may be implemented in specifications such as LTE Cat NB1 and/or LTE Cat NB2, and may not be limited to the above-mentioned names. Additionally and/or alternatively, the radio communication technologies implemented in the wireless devices in the present disclosure may communicate based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology and be called by various names such as enhanced MTC (eMTC). For example, LTE-M technology may be implemented in at least one of the various specifications, such as 1) LTE Cat 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) LTE M, and may not be limited to the above-mentioned names. Additionally and/or alternatively, the radio communication technologies implemented in the wireless devices in the present disclosure may include at least one of ZigBee, Bluetooth, and/or LPWAN which take into account low-power communication, and may not be limited to the above-mentioned names. For example, ZigBee technology may generate Personal Area Networks (PANs) associated with small/low-power digital communication based on various specifications such as IEEE 802.15.4 and may be called various names.

2 FIG. shows an example of wireless devices to which implementations of the present disclosure are applied.

2 FIG. 100 200 Referring to, a first wireless deviceand a second wireless devicemay transmit/receive radio signals to/from an external device through a variety of RATs (e.g., LTE and NR).

2 FIG. 1 FIG. 100 200 100 100 200 100 100 100 100 200 200 a f a f a f In, {the first wireless deviceand the second wireless device} may correspond to at least one of {the wireless devicetoand the BS}, {the wireless devicetoand the wireless deviceto} and/or {the BSand the BS} of.

100 106 101 108 The first wireless devicemay include at least one transceiver, such as a transceiver, at least one processing chip, such as a processing chip, and/or one or more antennas.

101 102 104 104 101 104 101 2 FIG. The processing chipmay include at least one processor, such a processor, and at least one memory, such as a memory. It is exemplarily shown inthat the memoryis included in the processing chip. Additional and/or alternatively, the memorymay be placed outside of the processing chip.

102 104 106 102 104 106 102 106 104 The processormay control the memoryand/or the transceiverand may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts described in the present disclosure. For example, the processormay process information within the memoryto generate first information/signals and then transmit radio signals including the first information/signals through the transceiver. The processormay receive radio signals including second information/signals through the transceiverand then store information obtained by processing the second information/signals in the memory.

104 102 104 104 105 102 105 102 105 102 105 102 The memorymay be operably connectable to the processor. The memorymay store various types of information and/or instructions. The memorymay store a software codewhich implements instructions that, when executed by the processor, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure. For example, the software codemay implement instructions that, when executed by the processor, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure. For example, the software codemay control the processorto perform one or more protocols. For example, the software codemay control the processorto perform one or more layers of the radio interface protocol.

102 104 106 102 108 106 106 100 Herein, the processorand the memorymay be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR). The transceivermay be connected to the processorand transmit and/or receive radio signals through one or more antennas. Each of the transceivermay include a transmitter and/or a receiver. The transceivermay be interchangeably used with Radio Frequency (RF) unit(s). In the present disclosure, the first wireless devicemay represent a communication modem/circuit/chip.

200 206 201 208 The second wireless devicemay include at least one transceiver, such as a transceiver, at least one processing chip, such as a processing chip, and/or one or more antennas.

201 202 204 204 201 204 201 2 FIG. The processing chipmay include at least one processor, such a processor, and at least one memory, such as a memory. It is exemplarily shown inthat the memoryis included in the processing chip. Additional and/or alternatively, the memorymay be placed outside of the processing chip.

202 204 206 202 204 206 202 106 204 The processormay control the memoryand/or the transceiverand may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts described in the present disclosure. For example, the processormay process information within the memoryto generate third information/signals and then transmit radio signals including the third information/signals through the transceiver. The processormay receive radio signals including fourth information/signals through the transceiverand then store information obtained by processing the fourth information/signals in the memory.

204 202 204 204 205 202 205 202 205 202 205 202 The memorymay be operably connectable to the processor. The memorymay store various types of information and/or instructions. The memorymay store a software codewhich implements instructions that, when executed by the processor, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure. For example, the software codemay implement instructions that, when executed by the processor, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure. For example, the software codemay control the processorto perform one or more protocols. For example, the software codemay control the processorto perform one or more layers of the radio interface protocol.

202 204 206 202 208 206 206 200 Herein, the processorand the memorymay be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR). The transceivermay be connected to the processorand transmit and/or receive radio signals through one or more antennas. Each of the transceivermay include a transmitter and/or a receiver. The transceivermay be interchangeably used with RF unit. In the present disclosure, the second wireless devicemay represent a communication modem/circuit/chip.

100 200 102 202 102 202 102 202 102 202 102 202 106 206 102 202 106 206 Hereinafter, hardware elements of the wireless devicesandwill be described more specifically. One or more protocol layers may be implemented by, without being limited to, one or more processorsand. For example, the one or more processorsandmay implement one or more layers (e.g., functional layers such as physical (PHY) layer, Media Access Control (MAC) layer, Radio Link Control (RLC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Resource Control (RRC) layer, and Service Data Adaptation Protocol (SDAP) layer). The one or more processorsandmay generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure. The one or more processorsandmay generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure. The one or more processorsandmay generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure and provide the generated signals to the one or more transceiversand. The one or more processorsandmay receive the signals (e.g., baseband signals) from the one or more transceiversandand acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.

102 202 102 202 102 202 102 202 104 204 102 202 The one or more processorsandmay be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processorsandmay be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in the one or more processorsand. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software and the firmware or software may be configured to include the modules, procedures, or functions. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure may be included in the one or more processorsandor stored in the one or more memoriesandso as to be driven by the one or more processorsand. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software in the form of code, commands, and/or a set of commands.

104 204 102 202 104 204 104 204 102 202 104 204 102 202 The one or more memoriesandmay be connected to the one or more processorsandand store various types of data, signals, messages, information, programs, code, instructions, and/or commands. The one or more memoriesandmay be configured by Read-Only Memories (ROMs), Random Access Memories (RAMs), Electrically Erasable Programmable ROMs (EEPROMs), flash memories, hard drives, registers, cash memories, computer-readable storage media, and/or combinations thereof. The one or more memoriesandmay be located at the interior and/or exterior of the one or more processorsand. The one or more memoriesandmay be connected to the one or more processorsandthrough various technologies such as wired or wireless connection.

106 206 106 206 106 206 102 202 102 202 106 206 102 202 106 206 The one or more transceiversandmay transmit user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure, to one or more other devices. The one or more transceiversandmay receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure, from one or more other devices. For example, the one or more transceiversandmay be connected to the one or more processorsandand transmit and receive radio signals. For example, the one or more processorsandmay perform control so that the one or more transceiversandmay transmit user data, control information, or radio signals to one or more other devices. The one or more processorsandmay perform control so that the one or more transceiversandmay receive user data, control information, or radio signals from one or more other devices.

106 206 108 208 106 206 108 208 108 208 The one or more transceiversandmay be connected to the one or more antennasandand the one or more transceiversandmay be configured to transmit and receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure, through the one or more antennasand. In the present disclosure, the one or more antennasandmay be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).

106 206 102 202 106 206 102 202 106 206 106 206 102 202 106 206 102 202 The one or more transceiversandmay convert received user data, control information, radio signals/channels, etc., from RF band signals into baseband signals in order to process received user data, control information, radio signals/channels, etc., using the one or more processorsand. The one or more transceiversandmay convert the user data, control information, radio signals/channels, etc., processed using the one or more processorsandfrom the base band signals into the RF band signals. To this end, the one or more transceiversandmay include (analog) oscillators and/or filters. For example, the one or more transceiversandcan up-convert OFDM baseband signals to OFDM signals by their (analog) oscillators and/or filters under the control of the one or more processorsandand transmit the up-converted OFDM signals at the carrier frequency. The one or more transceiversandmay receive OFDM signals at a carrier frequency and down-convert the OFDM signals into OFDM baseband signals by their (analog) oscillators and/or filters under the control of the one or more processorsand.

100 200 102 100 106 202 200 206 In the implementations of the present disclosure, a UE may operate as a transmitting device in UL and as a receiving device in DL. In the implementations of the present disclosure, a BS may operate as a receiving device in UL and as a transmitting device in DL. Hereinafter, for convenience of description, it is mainly assumed that the first wireless deviceacts as the UE, and the second wireless deviceacts as the BS. For example, the processor(s)connected to, mounted on or launched in the first wireless devicemay be configured to perform the UE behavior according to an implementation of the present disclosure or control the transceiver(s)to perform the UE behavior according to an implementation of the present disclosure. The processor(s)connected to, mounted on or launched in the second wireless devicemay be configured to perform the BS behavior according to an implementation of the present disclosure or control the transceiver(s)to perform the BS behavior according to an implementation of the present disclosure.

In the present disclosure, a BS is also referred to as a Node B (NB), an eNode B (eNB), or a gNB.

3 FIG. shows an example of a wireless device to which implementations of the present disclosure are applied.

1 FIG. The wireless device may be implemented in various forms according to a use-case/service (refer to).

3 FIG. 2 FIG. 2 FIG. 2 FIG. 2 FIG. 2 FIG. 100 200 100 200 100 200 110 120 130 140 110 112 114 112 102 202 104 204 114 106 206 108 208 120 110 130 140 100 200 120 100 200 130 120 130 110 130 110 Referring to, wireless devicesandmay correspond to the wireless devicesandofand may be configured by various elements, components, units/portions, and/or modules. For example, each of the wireless devicesandmay include a communication unit, a control unit, a memory unit, and additional components. The communication unitmay include a communication circuitand transceiver(s). For example, the communication circuitmay include the one or more processorsandofand/or the one or more memoriesandof. For example, the transceiver(s)may include the one or more transceiversandofand/or the one or more antennasandof. The control unitis electrically connected to the communication unit, the memory unit, and the additional componentsand controls overall operation of each of the wireless devicesand. For example, the control unitmay control an electric/mechanical operation of each of the wireless devicesandbased on programs/code/commands/information stored in the memory unit. The control unitmay transmit the information stored in the memory unitto the exterior (e.g., other communication devices) via the communication unitthrough a wireless/wired interface or store, in the memory unit, information received through the wireless/wired interface from the exterior (e.g., other communication devices) via the communication unit.

140 100 200 140 100 200 100 100 1 100 2 100 100 100 100 400 200 100 200 a b b c d e f 1 FIG. 1 FIG. 1 FIG. 1 FIG. 1 FIG. 1 FIG. 1 FIG. 1 FIG. The additional componentsmay be variously configured according to types of the wireless devicesand. For example, the additional componentsmay include at least one of a power unit/battery, Input/Output (I/O) unit (e.g., audio I/O port, video I/O port), a driving unit, and a computing unit. The wireless devicesandmay be implemented in the form of, without being limited to, the robot (of), the vehicles (-and-of), the XR device (of), the hand-held device (of), the home appliance (of), the IoT device (of), a digital broadcast terminal, a hologram device, a public safety device, an MTC device, a medicine device, a FinTech device (or a finance device), a security device, a climate/environment device, the AI server/device (of), the BSs (of), a network node, etc. The wireless devicesandmay be used in a mobile or fixed place according to a use-example/service.

3 FIG. 100 200 110 100 200 120 110 120 130 140 110 100 200 120 120 130 In, the entirety of the various elements, components, units/portions, and/or modules in the wireless devicesandmay be connected to each other through a wired interface or at least a part thereof may be wirelessly connected through the communication unit. For example, in each of the wireless devicesand, the control unitand the communication unitmay be connected by wire and the control unitand first units (e.g.,and) may be wirelessly connected through the communication unit. Each element, component, unit/portion, and/or module within the wireless devicesandmay further include one or more elements. For example, the control unitmay be configured by a set of one or more processors. As an example, the control unitmay be configured by a set of a communication control processor, an Application Processor (AP), an Electronic Control Unit (ECU), a Central Processing Unit (CPU), a Graphical Processing Unit (GPU), and a memory control processor. As another example, the memory unitmay be configured by a RAM, a Dynamic RAM (DRAM), a ROM, a flash memory, a volatile memory, a non-volatile memory, and/or a combination thereof.

4 FIG. shows an example of UE to which implementations of the present disclosure are applied.

4 FIG. 2 FIG. 3 FIG. 100 100 100 200 Referring to, a UEmay correspond to the first wireless deviceofand/or the wireless deviceorof.

100 102 104 106 108 141 142 143 144 145 146 147 A UEincludes a processor, a memory, a transceiver, one or more antennas, a power management module, a battery, a display, a keypad, a Subscriber Identification Module (SIM) card, a speaker, and a microphone.

102 102 100 102 102 102 102 102 The processormay be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure. The processormay be configured to control one or more other components of the UEto implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure. Layers of the radio interface protocol may be implemented in the processor. The processormay include ASIC, other chipset, logic circuit and/or data processing device. The processormay be an application processor. The processormay include at least one of DSP, CPU, GPU, a modem (modulator and demodulator). An example of the processormay be found in SNAPDRAGON™ series of processors made by Qualcomm®, EXYNOS™ series of processors made by Samsung®, A series of processors made by Apple®, HELIO™ series of processors made by MediaTek®, ATOM™ series of processors made by Intel® or a corresponding next generation processor.

104 102 102 104 104 102 104 102 102 102 The memoryis operatively coupled with the processorand stores a variety of information to operate the processor. The memorymay include ROM, RAM, flash memory, memory card, storage medium and/or other storage device. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, etc.) that perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure. The modules can be stored in the memoryand executed by the processor. The memorycan be implemented within the processoror external to the processorin which case those can be communicatively coupled to the processorvia various means as is known in the art.

106 102 106 106 106 108 The transceiveris operatively coupled with the processor, and transmits and/or receives a radio signal. The transceiverincludes a transmitter and a receiver. The transceivermay include baseband circuitry to process radio frequency signals. The transceivercontrols the one or more antennasto transmit and/or receive a radio signal.

141 102 106 142 141 The power management modulemanages power for the processorand/or the transceiver. The batterysupplies power to the power management module.

143 102 144 102 144 143 The displayoutputs results processed by the processor. The keypadreceives inputs to be used by the processor. The keypadmay be shown on the display.

145 The SIM cardis an integrated circuit that is intended to securely store the International Mobile Subscriber Identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephony devices (such as mobile phones and computers). It is also possible to store contact information on many SIM cards.

146 102 147 102 The speakeroutputs sound-related results processed by the processor. The microphonereceives sound-related inputs to be used by the processor.

5 6 FIGS.and show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure are applied.

5 FIG. 6 FIG. 5 FIG. 6 FIG. In particular,illustrates an example of a radio interface user plane protocol stack between a UE and a BS andillustrates an example of a radio interface control plane protocol stack between a UE and a BS. The control plane refers to a path through which control messages used to manage call by a UE and a network are transported. The user plane refers to a path through which data generated in an application layer, for example, voice data or Internet packet data are transported. Referring to, the user plane protocol stack may be divided into Layer 1 (i.e., a PHY layer) and Layer 2. Referring to, the control plane protocol stack may be divided into Layer 1 (i.e., a PHY layer), Layer 2, Layer 3 (e.g., an RRC layer), and a Non-Access Stratum (NAS) layer. Layer 1, Layer 2 and Layer 3 are referred to as an Access Stratum (AS).

In the 3GPP LTE system, the Layer 2 is split into the following sublayers: MAC, RLC, and PDCP. In the 3GPP NR system, the Layer 2 is split into the following sublayers: MAC, RLC, PDCP and SDAP. The PHY layer offers to the MAC sublayer transport channels, the MAC sublayer offers to the RLC sublayer logical channels, the RLC sublayer offers to the PDCP sublayer RLC channels, the PDCP sublayer offers to the SDAP sublayer radio bearers. The SDAP sublayer offers to 5G core network Quality of Service (QOS) flows.

In the 3GPP NR system, the main services and functions of the MAC sublayer include: mapping between logical channels and transport channels; multiplexing/de-multiplexing of MAC SDUs belonging to one or different logical channels into/from Transport Blocks (TB) delivered to/from the physical layer on transport channels; scheduling information reporting; error correction through Hybrid Automatic Repeat reQuest (HARQ) (one HARQ entity per cell in case of Carrier Aggregation (CA)); priority handling between UEs by means of dynamic scheduling; priority handling between logical channels of one UE by means of logical channel prioritization; padding. A single MAC entity may support multiple numerologies, transmission timings and cells. Mapping restrictions in logical channel prioritization control which numerology(ies), cell(s), and transmission timing(s) a logical channel can use.

Different kinds of data transfer services are offered by MAC. To accommodate different kinds of data transfer services, multiple types of logical channels are defined, i.e., each supporting transfer of a particular type of information. Each logical channel type is defined by what type of information is transferred. Logical channels are classified into two groups: control channels and traffic channels. Control channels are used for the transfer of control plane information only, and traffic channels are used for the transfer of user plane information only. Broadcast Control Channel (BCCH) is a downlink logical channel for broadcasting system control information, Paging Control Channel (PCCH) is a downlink logical channel that transfers paging information, system information change notifications and indications of ongoing Public Warning Service (PWS) broadcasts, Common Control Channel (CCCH) is a logical channel for transmitting control information between UEs and network and used for UEs having no RRC connection with the network, and Dedicated Control Channel (DCCH) is a point-to-point bi-directional logical channel that transmits dedicated control information between a UE and the network and used by UEs having an RRC connection. Dedicated Traffic Channel (DTCH) is a point-to-point logical channel, dedicated to one UE, for the transfer of user information. A DTCH can exist in both uplink and downlink. In downlink, the following connections between logical channels and transport channels exist: BCCH can be mapped to Broadcast Channel (BCH); BCCH can be mapped to Downlink Shared Channel (DL-SCH); PCCH can be mapped to Paging Channel (PCH); CCCH can be mapped to DL-SCH; DCCH can be mapped to DL-SCH; and DTCH can be mapped to DL-SCH. In uplink, the following connections between logical channels and transport channels exist: CCCH can be mapped to Uplink Shared Channel (UL-SCH); DCCH can be mapped to UL-SCH; and DTCH can be mapped to UL-SCH.

The RLC sublayer supports three transmission modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). The RLC configuration is per logical channel with no dependency on numerologies and/or transmission durations. In the 3GPP NR system, the main services and functions of the RLC sublayer depend on the transmission mode and include: transfer of upper layer PDUs; sequence numbering independent of the one in PDCP (UM and AM); error correction through ARQ (AM only); segmentation (AM and UM) and re-segmentation (AM only) of RLC SDUs; reassembly of SDU (AM and UM); duplicate detection (AM only); RLC SDU discard (AM and UM); RLC re-establishment; protocol error detection (AM only).

In the 3GPP NR system, the main services and functions of the PDCP sublayer for the user plane include: sequence numbering; header compression and decompression using Robust Header Compression (ROHC); transfer of user data; reordering and duplicate detection; in-order delivery; PDCP PDU routing (in case of split bearers); retransmission of PDCP SDUs; ciphering, deciphering and integrity protection; PDCP SDU discard; PDCP re-establishment and data recovery for RLC AM; PDCP status reporting for RLC AM; duplication of PDCP PDUs and duplicate discard indication to lower layers. The main services and functions of the PDCP sublayer for the control plane include: sequence numbering; ciphering, deciphering and integrity protection; transfer of control plane data; reordering and duplicate detection; in-order delivery; duplication of PDCP PDUs and duplicate discard indication to lower layers.

In the 3GPP NR system, the main services and functions of SDAP include: mapping between a QoS flow and a data radio bearer; marking QoS Flow ID (QFI) in both DL and UL packets. A single protocol entity of SDAP is configured for each individual PDU session.

In the 3GPP NR system, the main services and functions of the RRC sublayer include: broadcast of system information related to AS and NAS; paging initiated by 5G Core network (5GC) or Next-Generation Radio Access Network (NG-RAN); establishment, maintenance and release of an RRC connection between the UE and NG-RAN; security functions including key management; establishment, configuration, maintenance and release of Signaling Radio Bearers (SRBs) and Data Radio Bearers (DRBs); mobility functions (including: handover and context transfer, UE cell selection and reselection and control of cell selection and reselection, inter-RAT mobility); QoS management functions; UE measurement reporting and control of the reporting; detection of and recovery from radio link failure; NAS message transfer to/from NAS from/to UE.

7 FIG. shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure are applied.

7 FIG. The frame structure shown inis purely exemplary and the number of subframes, the number of slots, and/or the number of symbols in a frame may be variously changed. In the 3GPP based wireless communication system, OFDM numerologies (e.g., SCS, Transmission Time Interval (TTI) duration) may be differently configured between a plurality of cells aggregated for one UE. For example, if a UE is configured with different SCSs for cells aggregated for the cell, an (absolute time) duration of a time resource (e.g., a subframe, a slot, or a TTI) including the same number of symbols may be different among the aggregated cells. Herein, symbols may include OFDM symbols (or Cyclic Prefix (CP)-OFDM symbols), SC-FDMA symbols (or Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbols).

7 FIG. f sf u Referring to, downlink and uplink transmissions are organized into frames. Each frame has T=10 ms duration. Each frame is divided into two half-frames, where each of the half-frames has 5 ms duration. Each half-frame consists of 5 subframes, where the duration Tper subframe is 1 ms. Each subframe is divided into slots and the number of slots in a subframe depends on a subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on a CP. In a normal CP, each slot includes 14 OFDM symbols and, in an extended CP, each slot includes 12 OFDM symbols. The numerology is based on exponentially scalable subcarrier spacing Δf=2*15 kHz.

slot frame,u subframe,u u symb slot slot Table 3 shows the number of OFDM symbols per slot N, the number of slots per frame N, and the number of slots per subframe Nfor the normal CP, according to the subcarrier spacing Δf=2*15 kHz.

TABLE 3 u slot ymb Ns frame,u slot N subframe,u slot N 0 14  10  1 1 14  20  2 2 14  40  4 3 14  80  8 4 14 160 16

slot frame,u subframe,u u symb slot slot Table 4 shows the number of OFDM symbols per slot N, the number of slots per frame N, and the number of slots per subframe Nfor the extended CP, according to the subcarrier spacing Δf=2*15 kHz.

TABLE 4 u slot ymb Ns frame,u slot N subframe,u slot N 2 12 40 4

size,u RB start,u size,u RB RB size,u grid,x sc grid grid,x sc sc grid A slot includes plural symbols (e.g., 14 or 12 symbols) in the time domain. For each numerology (e.g., subcarrier spacing) and carrier, a resource grid of N*Nsubcarriers and/subframe,u symb OFDM symbols is defined, starting at Common Resource Block (CRB) Nindicated by higher-layer signaling (e.g., RRC signaling), where Nis the number of Resource Blocks (RBs) in the resource grid and the subscript x is DL for downlink and UL for uplink. Nis the number of subcarriers per RB. In the 3GPP based wireless communication system, Nis 12 generally. There is one resource grid for a given antenna port p, subcarrier spacing configuration u, and transmission direction (DL or UL). The carrier bandwidth Nfor subcarrier spacing configuration u is given by the higher-layer parameter (e.g., RRC parameter). Each element in the resource grid for the antenna port p and the subcarrier spacing configuration u is referred to as a Resource Element (RE) and one complex symbol may be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index/representing a symbol location relative to a reference point in the time domain. In the 3GPP based wireless communication system, an RB is defined by 12 consecutive subcarriers in the frequency domain.

size size size BWP,i PRB CRB PRB CRB BWP,i BWP,i In the 3GPP NR system, RBs are classified into CRBs and Physical Resource Blocks (PRBs). CRBs are numbered from 0 and upwards in the frequency domain for subcarrier spacing configuration u. The center of subcarrier 0 of CRB 0 for subcarrier spacing configuration u coincides with ‘point A’ which serves as a common reference point for resource block grids. In the 3GPP NR system, PRBs are defined within a BandWidth Part (BWP) and numbered from 0 to N−1, where i is the number of the bandwidth part. The relation between the physical resource block nin the bandwidth part i and the common resource block nis as follows: n=n+N, where Nis the common resource block where bandwidth part starts relative to CRB 0. The BWP includes a plurality of consecutive RBs. A carrier may include a maximum of N (e.g., 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Only one BWP among BWPs configured to the UE can active at a time. The active BWP defines the UE's operating bandwidth within the cell's operating bandwidth.

In the PHY layer, the uplink transport channels UL-SCH and Random Access Channel (RACH) are mapped to their physical channels Physical Uplink Shared Channel (PUSCH) and Physical Random Access Channel (PRACH), respectively, and the downlink transport channels DL-SCH, BCH and PCH are mapped to Physical Downlink Shared Channel (PDSCH), Physical Broadcast Channel (PBCH) and PDSCH, respectively. In the PHY layer, Uplink Control Information (UCI) is mapped to PUCCH, and Downlink Control Information (DCI) is mapped to Physical Downlink Control Channel (PDCCH). A MAC PDU related to UL-SCH is transmitted by a UE via a PUSCH based on an UL grant, and a MAC PDU related to DL-SCH is transmitted by a BS via a PDSCH based on a DL assignment.

As the amount of data traffic in cellular mobile communication systems has grown rapidly, technologies have been developed to transmit data over unlicensed spectrum bands. Unlicensed spectrum bands are frequency bands that are not licensed for cellular mobile communications, but are shared with other communications systems such as Wi-Fi. To allow multiple wireless access technologies to coexist, unlicensed frequency bands can use a channel access method based on energy detection behavior. LTE Licensed Assisted Access (LTE-LAA) and NR Unlicensed (NR-U) support Listen Before Talk (LBT) technology, which enables frequency sharing between multiple radio access technologies according to Carrier Sensing Multiple Access/Collision Avoidance (CSMA/CA) procedures.

LBT should always be performed before data can be transmitted in unlicensed frequency bands. In the typical transmission method of scheduling one PUSCH with one DCI, the transmission rate of uplink data may be significantly degraded. Therefore, in LTE enhanced LAA (eLAA) and/or NR-U, multiple TTI scheduling may be applied, which allows multiple PUSCHs to be scheduled with one DCI.

Furthermore, as the frequency of the carrier increases, phase noise becomes a major factor that degrades the performance of the communication system. The OFDM system employed by NR can mitigate the performance degradation caused by phase noise by widening the subcarrier spacing. For this reason, NR uses wider subcarrier spacing as the frequency of the carrier increases. For the same number of subcarriers, the wider subcarrier spacing reduces the length of the OFDM symbols and the length of a slot consisting of 14 OFDM symbols. If the UE attempts to receive PDCCH in every slot, the power consumption of the UE will also increase as the slot length decreases.

To address this, it may be proposed that the UE attempts to receive PDCCH in multiple slot cycles instead of every slot. However, by increasing the PDCCH reception interval from every slot to multiple slots, the power consumption of the UE can be prevented from increasing, but the data transmission rate may decrease. Therefore, techniques for scheduling multiple PUSCHs and/or PDSCHs with a single DCI, similar to the multiple TTI scheduling in NR-U, are being standardized.

8 FIG. shows an example of multiple TTI scheduling that schedules multiple PUSCHs with a single DCI to which implementations of the present disclosure are applied.

8 FIG. The one DCI to schedule a plurality of PUSCHs and/or multiple TTI scheduling shown inmay be used in NR-U. In addition, multiple TTI scheduling is a technique for reducing power consumption of UEs in frequency bands above 52 GHz, and can be applied to PDSCH scheduling as well as PUSCH.

8 FIG. 8 FIG. 8 FIG. 800 800 Referring to, the information delivered in the DCIincludes a Time Domain Resource Assignment (TDRA), a Modulation and Coding Scheme (MCS), a plurality of New Data Indicators (NDIs), a plurality of Redundancy Versions (RVs), and a Hybrid Automatic Repeat Request (HARQ) Process Number (PN). The TDRA indicates the index of the TDRA table which comprises time domain resource allocation information such as the number of PUSCHs to be scheduled along with the start symbol and length for each PUSCH, etc. The UE may obtain the number of PUSCHs scheduled by each DCI based on the TDRA. The MCS is applied equally to all PUSCHs. The NDI and RV consist of one bit for each PUSCH and as many bits as the maximum number of PUSCHs that can be scheduled by the TDRA table. HARQ PN is the HARQ process number of the first PUSCH, and the HARQ PN of the second and subsequent PUSCHs has a sequential value from the HARQ PN of the first PUSCH. The information included in the DCIshown inis illustrative only, and other information may be included, and some of the information described inmay be omitted.

Table 5 shows an example of an MCS index table for PUSCH when the modulation order is 64 Quadrature Amplitude Modulation (QAM).

TABLE 5 MCS Modulation Index Order Target code Rate Spectral MCS I m Q R × 1024 efficiency  0 q 240/q 0.2344  1 q 314/q 0.3066  2 2 193 0.377  3 2 251 0.4902  4 2 308 0.6016  5 2 379 0.7402  6 2 449 0.877  7 2 526 1.0273  8 2 602 1.1758  9 2 679 1.3262 10 4 340 1.3281 11 4 378 1.4766 12 4 134 1.6953 13 4 490 1.9141 14 4 553 2.1602 15 4 616 2.4063 16 4 658 2.5703 17 6 466 2.7305 18 6 517 3.0293 19 6 567 3.3223 20 6 616 3.6094 21 6 666 3.9023 22 6 719 4.2129 23 6 772 4.5234 24 6 822 4.8164 25 6 873 5.1152 26 6 910 5.332 27 6 948 5.5547 28 q reserved 29 2 reserved 30 4 reserved 31 6 reserved

8 FIG. 800 810 811 812 PUSCH HARQ PUSCH PUSCH PUSCH HARQ HARQ Referring to, the DCIschedules Nnumber of PUSCHs starting with HARQ PN K. The first PUSCH, PUSCH #1, corresponds to HARQ PN K. The HARQ PNs of the second and subsequent PUSCHs are calculated by a modulo operation from the HARQ PN K. For example, the HARQ PN of the second PUSCH, PUSCH #2, is calculated as (K+1) modulo N, and the HARQ PN of the N-th PUSCH, PUSCH #N, is calculated as (K+N−1) modulo N. Nis the number of HARQ processes in operation.

As described above, in multiple TTI scheduling, where multiple PUSCHs and/or multiple PDSCHs (hereinafter referred to as PUSCHs and PDSCHs collectively as PXSCHs) are scheduled by a single DCI, the same MCS may be applied to all of the multiple PXSCHs. That is, the data transmitted over each PXSCH will have the same physical transmission quality, even though the transmission quality required for the data transmitted over each PXSCH may be different (e.g., Block Error Rate (BLER), latency, etc.).

If multiple PXSCHs scheduled by a single DCI are all subject to the same MCS, it may be difficult to use radio resources efficiently, resulting in inefficient transmission and difficulty in ensuring transmission quality. For example, when transmitting two data streams with different target BLERs, to satisfy both target BLERs, the MCS should be determined based on the lower target BLER, which may result in excessive radio resources being allocated for the logical channel requiring the higher target BLER. Conversely, if the MCS is determined based on a high target BLER, the BLER of logical channels requiring lower target BLER may increase, resulting in transmission delays or, in the worst case, transmission failures. If a transmission failure occurs at the physical layer, it should be recovered by ARQ procedures at higher layers such as RLC, which requires additional radio resources and may significantly increase transmission delay.

To address this, it may be proposed that data streams requiring different QoS are scheduled with different DCIs. In this case, different MCSs are applied to data streams that require different QoS, which allows efficient use of radio resources, but the number of PDCCHs that need to be used increases by the number of data streams. The PDCCH is an additional channel for transmitting the actual data, and the increase in resources used for PDCCH may result in a decrease in overall system capacity. In addition, the number of PDCCHs and PXSCHs that a UE should process at any one time increases, which may increase system complexity and power usage. In particular, this may become an increasingly important issue in the future as the number of services supported simultaneously by a single UE increases and the number of UEs that need to be supported simultaneously in a wireless communication network increases.

Hereinafter, methods and apparatus are described that, in accordance with implementations of the present disclosure, can efficiently transmit multiple QoS data streams by applying different MCSs for each PXSCH while minimizing the increase in DCI size in multiple TTI scheduling where a single DCI schedules a plurality of PXSCHs.

In multiple TTI scheduling, where a single DCI is used to schedule a plurality of PXSCHs, applying a different MCS for each PXSCH to transmit a plurality of logical channels with different QoS may significantly increase the size of the DCI because as many MCSs as the number of PXSCHs being scheduled are required. Therefore, there is a need for a technique that can transmit PXSCHs with different MCSs depending on the required QoS without increasing the size of the DCI.

The lower the MCS of the PXSCH, i.e., the lower order modulation scheme and lower encoding rate used, the lower the BLER. Lower BLER also reduces transmission delay because it increases the probability of successful data transmission with fewer transmissions. Therefore, the higher the desired transmission reliability and the lower the desired transmission latency, the lower the MCS should be used.

According to implementations of the present disclosure, different MCSs may be applied for each PXSCH in multiple TTI scheduling. Further, according to implementations of the present disclosure, to minimize the increase in DCI size due to the increase in the amount of information associated with the MCS, the required MCS for each logical channel with data to be transmitted may be determined, the determined MCS may be sorted in ascending order, and the logical channels may be transmitted sequentially over the PXSCHs according to the sorted MCS order. In this case, the MCSs of each PXSCH may be sorted in ascending order, and only the difference between the lowest MCS (e.g., the reference MCS) and the MCS of each PXSCH may be transmitted over the DCI to minimize the increase in DCI size.

More specifically, when transmitting a plurality of logical channels with different QoS over a plurality of PXSCHs scheduled with a single DCI, the overall transmission quality and efficiency can be improved by transmitting logical channels that require high transmission reliability and low transmission delay at lower MCSs earlier in time, and transmitting logical channels that require low transmission reliability and high transmission delay at higher MCSs later in time. When transmitted in this manner, the MCS of the first transmitted PXSCH and the MCS of the later transmitted PXSCH are sorted in a monotonically increasing order from lower to higher values. In this case, the MCS of the first transmitted PXSCH may be transmitted via DCI, and the MCS of the later transmitted PXSCH may be transmitted via DCI by expressing only the difference between the MCS of the first transmitted PXSCH and the MCS of the later transmitted PXSCH. Accordingly, the DCI may be transmitted with fewer bits, without loss of information associated with the MCS.

According to implementations of the present disclosure, in the case of retransmissions, it may be difficult to transmit logical channels in ascending order of the MCSs, so the increase in DCI size may be minimized by transmitting the difference value from the reference MCS without sorting the logical channels in ascending order of the MCSs.

According to implementations of the present disclosure, new information included in the DCI and procedures may be defined to distinguish between cases in which logical channels are transmitted in ascending order of MCS, such as initial transmissions, and cases in which they are not, such as retransmissions.

The following drawings are created to explain specific embodiments of the present disclosure. The names of the specific devices or the names of the specific signals/messages/fields shown in the drawings are provided by way of example, and thus the technical features of the present disclosure are not limited to the specific names used in the following drawings.

9 FIG. shows an example of a method performed by a UE to which implementations of the present disclosure are applied.

900 In step S, the method comprises performing an initial access with a network.

910 In step S, the method comprises receiving one downlink control information from the network over a downlink control channel. The one downlink control information schedules both a first shared channel and a second shared channel, and the one downlink control information comprises a reference MCS index and a first offset value for the reference MCS index.

920 In step S, the method comprises communicating with the network over the first shared channel to which a first MCS index is applied. The first MCS index is based on the reference MCS index.

930 In step S, the method comprises, after communicating with the network over the first shared channel, communicating with the network over the second shared channel to which a second MCS index greater than the first MCS index is applied. The second MCS index is based on the reference MCS index and the first offset value.

In some implementations, the first MCS index may be same as the reference MCS index, and the second MCS index may be equal to the reference MCS index plus the first offset value.

In some implementations, the method may further comprise, communicating with the network over a third shared channel to which a third MCS index greater than the first MCS index is applied. The one downlink control information may schedule the third shared channel, and the one downlink control information may comprise a second offset value for the reference MCS index.

In some implementations, a communication over the third shared channel may be an initial transmission of data. Based on the communication over the third shared channel being the initial transmission of data, the third MCS index may be greater than the second MCS index, and the third MCS index may be equal to the reference MCS index plus the first offset value and the second offset value.

In some implementations, a communication over the third shared channel may be a retransmission of data. Based on the communication over the third shared channel being the retransmission of data, the third MCS index may be equal to the reference MCS index plus the second offset value.

In some implementations, the one downlink control information may comprise a Sorted Transmission Indicator (STI) for each of the first shared channel, the second shared channel, and the third shared channel. A value of the sorted transmission indicator may be 1 for shared channels whose MCS indices are sorted in ascending order, and a value of the sort transmission indicator may be 0 for shared channels whose MCS indices are not sorted in ascending order. When the one downlink control information includes the STI of each of the shared channels, the MCS indices of each of the shared channels may not be sorted in ascending order (i.e., unsorted transmission), even though the communication over each of the shared channels corresponds to an initial transmission of data. Furthermore, when the one downlink control information includes the STI of each of the shared channels, the MCS indices of each of the shared channels may be sorted in ascending order (i.e., sorted transmission), even though the communication over each of the shared channels corresponds to retransmission of data.

In some implementations, the one downlink control information may comprise an Unsorted Transmission Indicator (UTI) indicating whether MCS indices applied to the first shared channel, the second shared channel, and the third shared channel are sorted in ascending order.

For example, there may be a shared channel whose MCS indices are not sorted in ascending order from among the first shared channel, the second shared channel, and the third shared channel. In this case, a value of the unsorted transmission indicator may be 1, and the one downlink control information may comprise a sorted transmission indicator.

For example, MCS indices applied to the first shared channel, the second shared channel, and the third shared channel may be sorted in ascending order. In this case, a value of the unsorted transmission indicator may be 0, and the one downlink control information may not comprise a sorted transmission indicator.

Type-1-Offset-Bits Type-2-Offset-Bits Total-Offset-Bits In some implementations, N, a number of bits of each offset value of sorted transmissions and N, a number of bits of each offset value of unsorted transmissions included in the one downlink control information may be configured by RRC from the network, and a sum of total number of bits indicating an offset value from the reference MCS index may not exceed N.

Type-1-Offset-Bits Type-2-Offset-Bits Total-Offset-Bits In some implementations, N, a number of bits of each offset value of sorted transmissions and N, a number of bits of each offset value of unsorted transmissions included in the one downlink control information may be dynamically determined by the UE, and a sum of total number of bits indicating an offset value from the reference MCS index may not exceed N.

In some implementations, the shared channel may be a downlink shared channel (e.g., PDSCH) or an uplink shared channel (e.g., PUSCH) or a sidelink shared channel (e.g., PSSCH).

9 FIG. 2 FIG. 3 FIG. 4 FIG. 100 100 100 Furthermore, the method in perspective of the UE described above inmay be performed by the first wireless deviceshown in, the wireless deviceshown in, and/or the UEshown in.

More specifically, the UE comprises at least one transceiver, at least one processor, and at least one memory operably connectable to the at least one processor. The at least one memory stores instructions that, based on being executed by the at least one processor, perform operations below.

The UE performs an initial access with a network.

The UE receives, via the at least one transceiver, one downlink control information from the network over a downlink control channel. The one downlink control information schedules both a first shared channel and a second shared channel, and the one downlink control information comprises a reference MCS index and a first offset value for the reference MCS index.

The UE communicates, via the at least one transceiver, with the network over the first shared channel to which a first MCS index is applied. The first MCS index is based on the reference MCS index.

After communicating with the network over the first shared channel, the UE communicates, via the at least one transceiver, with the network over the second shared channel to which a second MCS index greater than the first MCS index is applied. The second MCS index is based on the reference MCS index and the first offset value.

In some implementations, the first MCS index may be same as the reference MCS index, and the second MCS index may be equal to the reference MCS index plus the first offset value.

In some implementations, the UE may further communicate with the network over a third shared channel to which a third MCS index greater than the first MCS index is applied. The one downlink control information may schedule the third shared channel, and the one downlink control information may comprise a second offset value for the reference MCS index.

In some implementations, a communication over the third shared channel may be an initial transmission of data. Based on the communication over the third shared channel being the initial transmission of data, the third MCS index may be greater than the second MCS index, and the third MCS index may be equal to the reference MCS index plus the first offset value and the second offset value.

In some implementations, a communication over the third shared channel may be a retransmission of data. Based on the communication over the third shared channel being the retransmission of data, the third MCS index may be equal to the reference MCS index plus the second offset value.

In some implementations, the one downlink control information may comprise a Sorted Transmission Indicator (STI) for each of the first shared channel, the second shared channel, and the third shared channel. A value of the sorted transmission indicator may be 1 for shared channels whose MCS indices are sorted in ascending order, and a value of the sort transmission indicator may be 0 for shared channels whose MCS indices are not sorted in ascending order. When the one downlink control information includes the STI of each of the shared channels, the MCS indices of each of the shared channels may not be sorted in ascending order (i.e., unsorted transmission), even though the communication over each of the shared channels corresponds to an initial transmission of data. Furthermore, when the one downlink control information includes the STI of each of the shared channels, the MCS indices of each of the shared channels may be sorted in ascending order (i.e., sorted transmission), even though the communication over each of the shared channels corresponds to retransmission of data.

In some implementations, the one downlink control information may comprise an Unsorted Transmission Indicator (UTI) indicating whether MCS indices applied to the first shared channel, the second shared channel, and the third shared channel are sorted in ascending order.

For example, there may be a shared channel whose MCS indices are not sorted in ascending order from among the first shared channel, the second shared channel, and the third shared channel. In this case, a value of the unsorted transmission indicator may be 1, and the one downlink control information may comprise a sorted transmission indicator.

For example, MCS indices applied to the first shared channel, the second shared channel, and the third shared channel may be sorted in ascending order. In this case, a value of the unsorted transmission indicator may be 0, and the one downlink control information may not comprise a sorted transmission indicator.

Type-1-Offset-Bits Type-2-Offset-Bits Total-Offset-Bits In some implementations, N, a number of bits of each offset value of sorted transmissions and N, a number of bits of each offset value of unsorted transmissions included in the one downlink control information may be configured by RRC from the network, and a sum of total number of bits indicating an offset value from the reference MCS index may not exceed N.

Type-1-Offset-Bits Type-2-Offset-Bits Total-Offset-Bits In some implementations, N, a number of bits of each offset value of sorted transmissions and N, a number of bits of each offset value of unsorted transmissions included in the one downlink control information may be dynamically determined by the UE, and a sum of total number of bits indicating an offset value from the reference MCS index may not exceed N.

In some implementations, the shared channel may be a downlink shared channel (e.g., PDSCH) or an uplink shared channel (e.g., PUSCH) or a sidelink shared channel (e.g., PSSCH).

9 FIG. 2 FIG. 3 FIG. 4 FIG. 102 100 110 120 100 102 100 Furthermore, the method in perspective of the UE described above inmay be performed by control of the processorincluded in the first wireless deviceshown in, by control of the communication unitand/or the control unitincluded in the wireless deviceshown in, and/or by control of the processorincluded in the UEshown in.

More specifically, a processing apparatus operating in a wireless communication system comprises at least one processor, and at least one memory operably connectable to the at least one processor. The at least one processor is adapted to perform operations comprising: obtaining one downlink control information which schedules both a first shared channel and a second shared channel: communicating over the first shared channel to which a first MCS index is applied; and after communicating over the first shared channel, communicating over the second shared channel to which a second MCS index greater than the first MCS index is applied. The one downlink control information comprises a reference MCS index and a first offset value for the reference MCS index. The first MCS index is based on the reference MCS index. The second MCS index is based on the reference MCS index and the first offset value.

9 FIG. 2 FIG. 105 104 100 Furthermore, the method in perspective of the UE described above inmay be performed by a software codestored in the memoryincluded in the first wireless deviceshown in.

The technical features of the present disclosure may be embodied directly in hardware, in a software executed by a processor, or in a combination of the two. For example, a method performed by a wireless device in a wireless communication may be implemented in hardware, software, firmware, or any combination thereof. For example, a software may reside in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, a removable disk, a CD-ROM, or any other storage medium.

Some example of storage medium may be coupled to the processor such that the processor can read information from the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. For other example, the processor and the storage medium may reside as discrete components.

The computer-readable medium may include a tangible and non-transitory computer-readable storage medium.

For example, non-transitory computer-readable media may include RAM such as synchronous dynamic random access memory (SDRAM), ROM, non-volatile random access memory (NVRAM), EEPROM, flash memory, magnetic or optical data storage media, or any other medium that can be used to store instructions or data structures. Non-transitory computer-readable media may also include combinations of the above.

In addition, the method described herein may be realized at least in part by a computer-readable communication medium that carries or communicates code in the form of instructions or data structures and that can be accessed, read, and/or executed by a computer.

According to some implementations of the present disclosure, a non-transitory computer-readable medium (CRM) has stored thereon a plurality of instructions.

More specifically, CRM stores instructions that, based on being executed by at least one processor, perform operations comprising: obtaining one downlink control information which schedules both a first shared channel and a second shared channel; communicating over the first shared channel to which a first MCS index is applied; and after communicating over the first shared channel, communicating over the second shared channel to which a second MCS index greater than the first MCS index is applied. The one downlink control information comprises a reference MCS index and a first offset value for the reference MCS index. The first MCS index is based on the reference MCS index. The second MCS index is based on the reference MCS index and the first offset value.

10 FIG. shows an example of a method performed by a base station to which implementations of the present disclosure are applied.

1000 In step S, the method comprises performing an initial access with a UE.

1010 In step S, the method comprises transmitting one downlink control information to the UE over a downlink control channel. The one downlink control information schedules both a first shared channel and a second shared channel, and the one downlink control information comprises a reference MCS index and a first offset value for the reference MCS index.

1020 In step S, the method comprises communicating with the UE over the first shared channel to which a first MCS index is applied. The first MCS index is based on the reference MCS index.

1030 In step S, the method comprises, after communicating with the UE over the first shared channel, communicating with the UE over the second shared channel to which a second MCS index greater than the first MCS index is applied. The second MCS index is based on the reference MCS index and the first offset value.

In some implementations, the first MCS index may be same as the reference MCS index, and the second MCS index may be equal to the reference MCS index plus the first offset value.

In some implementations, the method may further comprise, communicating with the UE over a third shared channel to which a third MCS index greater than the first MCS index is applied. The one downlink control information may schedule the third shared channel, and the one downlink control information may comprise a second offset value for the reference MCS index.

In some implementations, a communication over the third shared channel may be an initial transmission of data. Based on the communication over the third shared channel being the initial transmission of data, the third MCS index may be greater than the second MCS index, and the third MCS index may be equal to the reference MCS index plus the first offset value and the second offset value.

In some implementations, a communication over the third shared channel may be a retransmission of data. Based on the communication over the third shared channel being the retransmission of data, the third MCS index may be equal to the reference MCS index plus the second offset value.

In some implementations, the one downlink control information may comprise a STI for each of the first shared channel, the second shared channel, and the third shared channel. A value of the sorted transmission indicator may be 1 for shared channels whose MCS indices are sorted in ascending order, and a value of the sort transmission indicator may be 0 for shared channels whose MCS indices are not sorted in ascending order. When the one downlink control information includes the STI of each of the shared channels, the MCS indices of each of the shared channels may not be sorted in ascending order (i.e., unsorted transmission), even though the communication over each of the shared channels corresponds to an initial transmission of data. Furthermore, when the one downlink control information includes the STI of each of the shared channels, the MCS indices of each of the shared channels may be sorted in ascending order (i.e., sorted transmission), even though the communication over each of the shared channels corresponds to retransmission of data.

In some implementations, the one downlink control information may comprise an UTI indicating whether MCS indices applied to the first shared channel, the second shared channel, and the third shared channel are sorted in ascending order.

For example, there may be a shared channel whose MCS indices are not sorted in ascending order from among the first shared channel, the second shared channel, and the third shared channel. In this case, a value of the unsorted transmission indicator may be 1, and the one downlink control information may comprise a sorted transmission indicator.

For example, MCS indices applied to the first shared channel, the second shared channel, and the third shared channel may be sorted in ascending order. In this case, a value of the unsorted transmission indicator may be 0, and the one downlink control information may not comprise a sorted transmission indicator.

In some implementations, the shared channel may be a downlink shared channel (e.g., PDSCH) or an uplink shared channel (e.g., PUSCH) or a sidelink shared channel (e.g., PSSCH).

10 FIG. 2 FIG. 3 FIG. 200 100 Furthermore, the method in perspective of the base station described above inmay be performed by the second wireless deviceshown in, and/or the wireless deviceshown in.

More specifically, the base station comprises at least one transceiver, at least one processor, and at least one memory operably connectable to the at least one processor. The at least one memory stores instructions that, based on being executed by the at least one processor, perform operations below.

The base station performs an initial access with a UE.

The base station transmits one downlink control information to the UE over a downlink control channel. The one downlink control information schedules both a first shared channel and a second shared channel, and the one downlink control information comprises a reference MCS index and a first offset value for the reference MCS index.

The base station communicates with the UE over the first shared channel to which a first MCS index is applied. The first MCS index is based on the reference MCS index.

After communicating with the UE over the first shared channel, the base station communicates with the UE over the second shared channel to which a second MCS index greater than the first MCS index is applied. The second MCS index is based on the reference MCS index and the first offset value.

In some implementations, the first MCS index may be same as the reference MCS index, and the second MCS index may be equal to the reference MCS index plus the first offset value.

In some implementations, the base station may further communicate with the UE over a third shared channel to which a third MCS index greater than the first MCS index is applied. The one downlink control information may schedule the third shared channel, and the one downlink control information may comprise a second offset value for the reference MCS index.

In some implementations, a communication over the third shared channel may be an initial transmission of data. Based on the communication over the third shared channel being the initial transmission of data, the third MCS index may be greater than the second MCS index, and the third MCS index may be equal to the reference MCS index plus the first offset value and the second offset value.

In some implementations, a communication over the third shared channel may be a retransmission of data. Based on the communication over the third shared channel being the retransmission of data, the third MCS index may be equal to the reference MCS index plus the second offset value.

In some implementations, the one downlink control information may comprise a STI for each of the first shared channel, the second shared channel, and the third shared channel. A value of the sorted transmission indicator may be 1 for shared channels whose MCS indices are sorted in ascending order, and a value of the sort transmission indicator may be 0 for shared channels whose MCS indices are not sorted in ascending order. When the one downlink control information includes the STI of each of the shared channels, the MCS indices of each of the shared channels may not be sorted in ascending order (i.e., unsorted transmission), even though the communication over each of the shared channels corresponds to an initial transmission of data. Furthermore, when the one downlink control information includes the STI of each of the shared channels, the MCS indices of each of the shared channels may be sorted in ascending order (i.e., sorted transmission), even though the communication over each of the shared channels corresponds to retransmission of data.

In some implementations, the one downlink control information may comprise an UTI indicating whether MCS indices applied to the first shared channel, the second shared channel, and the third shared channel are sorted in ascending order.

For example, there may be a shared channel whose MCS indices are not sorted in ascending order from among the first shared channel, the second shared channel, and the third shared channel. In this case, a value of the unsorted transmission indicator may be 1, and the one downlink control information may comprise a sorted transmission indicator.

For example, MCS indices applied to the first shared channel, the second shared channel, and the third shared channel may be sorted in ascending order. In this case, a value of the unsorted transmission indicator may be 0, and the one downlink control information may not comprise a sorted transmission indicator.

In some implementations, the shared channel may be a downlink shared channel (e.g., PDSCH) or an uplink shared channel (e.g., PUSCH) or a sidelink shared channel (e.g., PSSCH).

Various implementations of the present disclosure will be described below with reference to the drawings.

A first implementation of the present disclosure provides various examples of configuring a DCI to schedule a plurality of PXSCHs in multiple TTI scheduling.

11 FIG. shows an example of a method of delivering MCS information when scheduling a plurality of PXSCHs with a single DCI, to which the first implementation of the present disclosure is applied.

11 FIG. 1100 1100 1110 1111 1112 1113 HARQ HARQ HARQ Referring to, a DCIis transmitted that schedules four PXSCHs starting with HARQ PN K. The DCIschedules PXSCH #1corresponding to HARQ PN K, PXSCH #2corresponding to HARQ PN (K+1) modulo N, PXSCH #3corresponding to HARQ PN (K+2) modulo N, and PXSCH #4corresponding to HARQ PN (K+3) modulo N.

1110 1113 1110 1111 1112 1113 1110 1111 1112 1113 1 2 3 4 1 2 3 4 Depending on the QoS of the data to be transmitted (e.g., transmission reliability, latency, etc.), the data to be transmitted with the lowest MCS (i.e., corresponding to high transmission reliability and low latency) is mapped to PXSCH #1, and the data to be transmitted with the highest MCS (i.e., corresponding to low transmission reliability and high latency) is mapped to PXSCH #4. Thus, the MCS indices of PXSCH #1, PXSCH #2, PXSCH #3, and PXSCH #4are sorted in ascending order. The MCS indices of PXSCH #1, PXSCH #2, PXSCH #3, and PXSCH #4may be represented by I, I, I, and I, respectively (I≤I≤I≤I).

1 2 3 4 1 1 1110 1111 1112 1113 1110 1100 1100 1110 1100 If the MCS indices I, I, I, and Iof PXSCH #1, PXSCH #2, PXSCH #3, and PXSCH #4are included in the DCI as they are, the size of the DCI will be large. To avoid this, the MCS index Iof PXSCH #1may be included in the DCI, and the MCS indices of subsequent PXSCHs may be represented only by their difference from the MCS index of the immediately preceding PXSCH, and that difference may be included in the DCI. Using the MCS index Iof PXSCH #1and subsequent difference values transmitted via DCI, the UE may calculate the MCS index of each PXSCH.

11 FIG. 1100 1110 1111 1100 1111 1111 1110 1112 1100 1112 1112 1111 1113 1100 1113 1113 1112 1111 1110 1 2 2 1 2 2 2 2 2 1 3 3 1 2 3 3 3 3 3 2 4 4 1 2 3 4 4 4 4 3 1 For example, in, the DCIincludes the MCS index Iof PXSCH #1. The MCS index Iof PXSCH #2may be expressed as I=I+O, whereby DCIincludes Oinstead of the MCS index Iof PXSCH #1. That is, Ois the MCS index Iof PXSCH #2minus the MCS index Iof PXSCH #1. The MCS index Iof PXSCH #3may be expressed as I=I+O+O, whereby DCIincludes Oinstead of the MCS index Iof PXSCH #3. That is, Ois the MCS index Iof PXSCH #3minus the MCS index Iof PXSCH #2. The MCS index Iof PXSCH #4may be expressed as I=I+O+O+O, whereby DCIincludes 04 instead of the MCS index Iof PXSCH #4. That is, Ois the MCS index Iof PXSCH #4minus the MCS index Iof PXSCH #3. The MCS indices after PXSCH #2may be obtained by adding the MCS index Iof PXSCH #1to the difference of all MCS indices up to that PXSCH.

12 FIG. shows an example where initial transmission PXSCHs and retransmission PXSCHs are scheduled with a single DCI, to which the first implementation of the present disclosure is applied.

11 FIG. When there is at least one retransmission PXSCH among a plurality of PXSCHs scheduled with a single DCI, it may be difficult to arrange the PXSCHs in ascending order MCS indices for transmission as described in.

12 FIG. 1200 1210 1220 1220 1230 1231 1232 1234 HARQ HARQ HARQ HARQ Referring to, a DCI #1is transmitted that schedules PXSCH #1corresponding to HARQ PN (K+1) modulo N. In addition, a DCI #2is transmitted that schedules PXSCH #1-1 and PXSCH #2-#4. DCI #2schedules PXSCH #2corresponding to HARQ PN K, PXSCH #1-1corresponding to HARQ PN (K+1) modulo N, PXSCH #3corresponding to HARQ PN (K+2) modulo N, and PXSCH #4corresponding to HARQ PN (K+3) modulo N.

1231 1210 1210 1200 1231 1220 1230 1232 1233 1231 1210 1231 1230 1232 1233 PXSCH #1-1is retransmission PXSCH of PXSCH #1. That is, PXSCH #1scheduled with DCI #1and transmitted is retransmitted as PXSCH #1-1scheduled with DCI #2. PXSCH #2, PXSCH #3, and PXSCH #4are initial transmission PXSCHs that transmit new data, which can be transmitted in ascending order MCS indices depending on the QoS of the data to be transmitted. However, PXSCH #1-1is retransmission PXSCH of PXSCH #1, which may be difficult to transmit in ascending order of MCS index with other PXSCHs. For example, the MCS index of PXSCH #1-1may be less than the MCS index of PXSCH #2, or it may be greater than the MCS index of PXSCH #3or PXSCH #4.

13 FIG. shows an example of a method of delivering MCS information when scheduling only a plurality of retransmission PXSCHs with a single DCI, to which the first implementation of the present disclosure is applied.

12 FIG. 11 As described in, when two or more PXSCHs are retransmitted, the MCS indices between the retransmission PXSCHs may not be sorted in ascending order. Therefore, the MCS index of the retransmission PXSCH may be difficult to transmit by expressing the MCS index of the retransmission PXSCH as the difference between the MCS index of the immediately preceding PXSCH as described in FIG.. Therefore, in this case, the smallest value of the MCS index of the retransmission PXSCH may be considered as the reference MCS index, and the amount of MCS information that needs to be transmitted via the DCI may be reduced by transmitting the difference value of the MCS index of each PXSCH.

13 FIG. 1300 1300 1310 1311 1312 1313 HARQ HARQ HARQ Referring to, a DCIis transmitted that schedules four PXSCHs starting with HARQ PN K. The DCIschedules PXSCH #1-1corresponding to HARQ PN K, PXSCH #2-1corresponding to HARQ PN (K+1) modulo N, PXSCH #3-1corresponding to HARQ PN (K+2) modulo N, and PXSCH #4-1corresponding to HARQ PN (K+3) modulo N.

1310 1311 1312 1313 1310 1311 1312 1313 1310 1311 1312 1313 1 2 3 4 PXSCH #1-1, PXSCH #2-1, PXSCH #3-1, and PXSCH #4-1all correspond to retransmission PXSCHs. The MCS indices of PXSCH #1-1, PXSCH #2-1, PXSCH #3-1, and PXSCH #4-1may be represented by I, I, I, and I, respectively. However, the MCS indices of PXSCH #1-1, PXSCH #2-1, PXSCH #3-1, and PXSCH #4-1may not be sorted in ascending order.

1300 1300 1300 REF REF 1 2 3 4 REF REF REF REF REF 13 FIG. The DCIincludes a reference MCS index I. Imay be the smallest MCS index among I, I, I, and I. Alternatively, Imay be the MCS index that has the smallest value among the MCS indices of other retransmission PXSCHs not represented in. Following the reference MCS index I, the difference between the MCS index of each PXSCH and the reference MCS index Iis included in the DCI. Using the reference MCS index Iand the difference between the MCS index of each PXSCH and the reference MCS index Itransmitted via the DCI, the UE may calculate the MCS index of each PXSCH.

13 FIG. 1300 1310 1300 1310 1311 1300 1311 1312 1300 1312 1313 1300 1313 REF 1 1 REF 1 1 1 2 2 REF 2 2 2 3 3 REF 3 3 3 4 4 REF 4 4 4 For example, in, the DCIincludes the reference MCS index I. The MCS index Iof PXSCH #1-1may be expressed as I=I+O, whereby the DCIincludes Oinstead of MCS index Iof PXSCH #1-1. The MCS index Iof PXSCH #2-1may be expressed as I=I+O, whereby the DCIincludes Oinstead of the MCS index Iof PXSCH #2-1. The MCS index Iof PXSCH #3-1may be expressed as I=I+O, whereby the DCIincludes Oinstead of the MCS index Iof PXSCH #3-1. The MCS index Iof PXSCH #4-1may be expressed as I=I+O, whereby the DCIincludes Oinstead of the MCS index Iof PXSCH #4-1.

14 FIG. shows an example of a method of delivering MCS information when scheduling initial transmission PXSCHs and retransmission PXSCHs with a single DCI, to which the first implementation of the present disclosure is applied.

14 FIG. 11 FIG. 13 FIG. The initial transmission and retransmission PXSCHs may be scheduled together with a single DCI by delivering the difference between the reference MCS index IREF and the MCS index of each PXSCH via the DCI, and by differentiating the calculation method of the MCS index of the initial transmission PXSCH and the retransmission PXSCH. The MCS index of the initial transmission PXSCH may be added to the reference MCS index as the cumulative difference of all MCS indices up to that PXSCH, while the MCS index of the retransmission PXSCH may be added to the reference MCS index as the difference of only the MCS index corresponding to that PXSCH. In other words,may be viewed as a combination of the method described inand the method described in. The UE may distinguish the initial transmission PXSCH from the transmission PXSCH by the NDI carried over the DCI.

14 FIG. 1400 1400 1410 1411 1412 1413 HARQ HARQ HARQ Referring to, a DCIis transmitted that schedules four PXSCHs starting with HARQ PN K. The DCIschedules PXSCH #1corresponding to HARQ PN K, PXSCHs #2-1corresponding to HARQ PN (K+1) modulo N, PXSCH #3corresponding to HARQ PN (K+2) modulo N, and PXSCH #4corresponding to HARQ PN (K+3) modulo N.

1410 1412 1413 1410 1412 1413 1410 1412 1413 1411 1411 1411 1 3 4 1 3 4 2 2 1 2 4 PXSCH #1, PXSCH #3, and PXSCH #4correspond to the initial transmission PXSCHs. The MCS indices of PXSCH #1, PXSCH #3, and PXSCH #4may be represented by I, I, and I, respectively. The MCS indices of PXSCH #1, PXSCH #3, and PXSCH #4may be sorted in ascending order (i.e., I≤I<I). On the other hand, PXSCH #2-1corresponds to a retransmission PXSCH. The MCS index of PXSCH #2-1may be represented by I. The MCS index of PXSCH #2-1may or may not be sorted in ascending order with other MCS indices. For example, it may be I<I, or I>I3 or I.

1400 1400 1400 1400 REF REF 1 2 3 4 REF REF REF REF REF DCIincludes a reference MCS index I. Imay be the smallest MCS index among I, I, I, and I. Alternatively, Imay be the MCS index that has the smallest value among the MCS indices of all initial transmission PXSCHs and retransmission PXSCHs scheduled with the DCI. Following the reference MCS index I, the difference between the MCS index of each PXSCH and the reference MCS index Iis included in the DCI. Using the reference MCS index Iand the difference between the MCS index of each PXSCH and the reference MCS index Itransmitted via the DCI, the UE may calculate the MCS index of each PXSCH.

14 FIG. 1400 1410 1400 1410 1411 1411 1400 1411 1412 1412 1400 1412 1413 1413 1400 1413 REF 1 1 REF 1 1 1 2 2 REF 2 2 2 3 3 REF 1 3 3 3 4 4 REF 1 3 4 4 4 For example, in, the DCIincludes the reference MCS index I. The MCS index Iof PXSCH #1may be expressed as I=I+O, whereby the DCIincludes Oinstead of the MCS index Iof PXSCH #1. Since PXSCH #2-1is a retransmission PXSCH, the MCS index Iof PXSCH #2-1may be represented as I=I+O, whereby the DCIincludes Oinstead of the MCS index Iof PXSCH #2-1. Since PXSCH #3is an initial transmission PXSCH, the MCS index Iof PXSCH #3may be represented as I=I+O+O, whereby the DCIincludes Oinstead of the MCS index Iof PXSCH #3. Since PXSCH #4is an initial transmission PXSCH, the MCS index Iof PXSCH #4may be represented as I=I+O+O+O, whereby the DCIincludes Oinstead of the MCS index Iof PXSCH #4.

15 FIG. shows an example of a UE miscalculating an MCS index when scheduling initial transmission PXSCHs and retransmission PXSCHs with a single DCI, to which the first implementation of the present disclosure is applied.

14 FIG. As described in, in order to calculate the MCS index of the initial transmission PXSCHs and the MCS index of the retransmission PXSCHs differently when scheduling the initial transmission PXSCHs and the retransmission PXSCHs with one DCI, the UE should be able to clearly distinguish between the initial transmission PXSCHs and the retransmission PXSCHs. In general, the initial transmission PXSCHs and retransmission PXSCHs may be distinguished by the NDI carried in the DCI. However, it is possible that the UE does not detect the DCI scheduling the initial transmission PXSCH and sends a Discontinuous Transmission (DTX), which the base station may mistakenly recognize as a Negative Acknowledgment (NACK) and perform a retransmission of the PXSCH. In this case, the UE may have difficulty accurately determining whether the retransmission PXSCH is actually an initial transmission PXSCH or a retransmission PXSCH, and consequently may incorrectly calculate the MCS index of that PXSCH.

15 FIG. 1500 1510 1510 1500 HARQ Referring to, DCI #1is transmitted that schedules PXSCH #1corresponding to HARQ PN (K+1) modulo N. The NDI corresponding to PXSCH #1is 0. However, the UE does not receive DCI #1, and therefore the UE does not transmit a HARQ-ACK and/or transmits a DTX.

1520 1520 1530 1531 1532 1533 HARQ HARQ HARQ In addition, DCI #2is transmitted that schedules PXSCH #1-1 and PXSCH #2-#4. DCI #2schedules PXSCH #2corresponding to HARQ PN K, PXSCH #1-1corresponding to HARQ PN (K+1) modulo N, PXSCH #3corresponding to HARQ PN (K+2) modulo N, and PXSCH #4corresponding to HARQ PN (K+3) modulo N.

1531 1510 1510 1500 1531 1520 1531 1510 1530 1532 1533 PXSCH #1-1is a retransmission PXSCH of PXSCH #1. That is, PXSCH #1scheduled with DCI #1and transmitted is retransmitted as PXSCH #1-1scheduled with DCI #2. This is because the base station mistakenly recognized the DTX as a NACK. The NDI corresponding to PXSCH #1-1is 0, which is the same as the NDI corresponding to PXSCH #1. Since the NDI is not toggled, this implies a retransmission. PXSCH #2, PXSCH #3, and PXSCH #4are initial transmission PXSCHs that transmit new data.

1531 1531 1531 That is, although the base station transmitted PXSCH #1-1as a retransmission PXSCH, the UE may determine that PXSCH #1-1is an initial transmission PXSCH. As a result, an error may occur when the UE calculates the MCS index of the PXSCH starting from PXSCH #1-1.

15 FIG. 1520 1531 1520 1530 1531 1532 1533 1531 1520 1530 1531 1532 1533 REF 1 2 3 4 1 2 3 4 1 2 3 4 1 REF 1 2 REF 2 3 REF 1 3 4 REF 1 3 4 REF 1 2 3 4 1 2 3 4 1 REF 1 2 REF 1 2 3 REF 1 2 3 4 REF 1 2 3 4 For example, in, the DCIincludes a reference MCS index Iand difference values O, O, O, and Ofrom the MCS index of each PXSCH. Since the base station considers PXSCH #1-1as a retransmission PXSCH, the difference values O, O, O, and Oincluded in the DCImeans that the MCS indices I, I, I, and Iof PXSCH #2, PXSCH #1-1, PXSCH #3, and PXSCH #4are calculated as I=I+O, I=I+O, I=I+O+O, and I=I+O+O+O, respectively. However, since the UE considers PXSCH #1-1as an initial transmission PXSCH, the UE uses the reference MCS index Iand the difference values O, O, O, and Oincluded in the DCIto calculate the MCS indices I, I, I, and Iof PXSCH #2, PXSCH #1-1, PXSCH #3, and PXSCH #4as I=I+O, I=I+O+O, I=I+O+O+O, and I=I+O+O+O+O, respectively. This means that the MCS calculations between the base station and the UE do not match.

16 FIG. shows an example of a UE accurately calculating an MCS index using a sorted transmission indicator bitmap when scheduling initial transmission PXSCHs and retransmission PXSCHs with a single DCI, to which the first implementation of the present disclosure is applied.

15 FIG. To address the problem described in, the DCI that schedules the initial transmission PXSCHs and/or the retransmission PXSCHs may include a Sorted Transmission Indicator (STI) bitmap that indicates whether each PXSCH is sorted in ascending order of MCS index, starting from the reference MCS index. The length of the STI bitmap may be equal to the number of PXSCHs scheduled by the DCI.

REF n n n n n n For example, if the reference MCS index is I, the STI of the n-th (>0 integer) PXSCH is S(0 or 1), and the difference of the MCS index of the n-th PXSCH is O(≥0 integer), then the MCS index In of the n-th PXSCH may be calculated by Equation 1 and Equation 2. Equation 1 may represent the case where S=0 of the n-th PXSCH, and Equation 2 may represent the case where S=1 of the n-th PXSCH. S=0 may represent a retransmission, and S=1 may represent an initial transmission.

n n n n However, it is not always necessary to set S=0 for retransmission and S=1 for initial transmission. Even for retransmission, S=1 may be set if the MCS indices of PXSCHs are sorted in ascending order. Even for initial transmission, S=0 may be set to ensure that the MCS index is calculated only as the difference between the reference MCS index and the MCS index of the corresponding PXSCH.

16 FIG. 1600 1610 1610 1600 HARQ Referring to, DCI #1is transmitted that schedules PXSCH #1corresponding to HARQ PN (K+1) modulo N. The NDI corresponding to PXSCH #1is 0. However, the UE does not receive DCI #1, and therefore the UE does not transmit a HARQ-ACK and/or transmits a DTX.

1620 1620 1630 1631 1632 1633 HARQ HARQ HARQ In addition, DCI #2is transmitted that schedules PXSCH #1-1 and PXSCH #2-#4. DCI #2schedules PXSCH #2corresponding to HARQ PN K, PXSCH #1-1corresponding to HARQ PN (K+1) modulo N, PXSCH #3corresponding to HARQ PN (K+2) modulo N, and PXSCH #4corresponding to HARQ PN (K+3) modulo N.

1631 1610 1610 1600 1631 1620 1631 1610 1630 1632 1633 PXSCH #1-1is a retransmission PXSCH of PXSCH #1. That is, PXSCH #1scheduled with DCI #1and transmitted is retransmitted as PXSCH #1-1scheduled with DCI #2. This is because the base station mistakenly recognized the DTX as a NACK. The NDI corresponding to PXSCH #1-1is NDI=0, which is the same as the NDI corresponding to PXSCH #1. Since the NDI is not toggled, this implies a retransmission. PXSCH #2, PXSCH #3, and PXSCH #4are the initial transmission PXSCHs that send the new data.

1620 1630 1631 1632 1633 1620 1630 1632 1633 1631 16 FIG. DCI #2further includes an STI bitmap. In, the STI bitmap is “1011”. This may mean that the STIs of PXSCH #2, PXSCH #1-1, PXSCH #3, and PXSCH #4scheduled by DCI #2are 1, 0, 1, and 1, respectively, which may mean that PXSCH #2, PXSCH #3, and PXSCH #4are sorted transmission PXSCHs, and PXSCH #1-1is an unsorted transmission PXSCH.

1631 1631 1620 Although the base station transmitted PXSCH #1-1as a retransmission PXSCH, the UE may determine that PXSCH #1-1is an initial transmission PXSCH. However, the UE can correctly calculate the MCS index by calculating the MCS index of each PXSCH using the STI bitmap included in DCI #2. The UE may calculate the MCS index of each PXSCH using Equation 1 and Equation 2 described above, which is consistent with the MCS index of each PXSCH calculated by the base station.

17 FIG. shows an example of a method of delivering MCS information using an unsorted transmission indicator, to which the first implementation of the present disclosure is applied.

16 FIG. n As described in, sending the STI bitmap together over DCI may solve the problem of misaligned calculation of the MCS index between the base station and UE, but since as many bits are required as there are PXSCHs, it may be inefficient to send the STI bitmap over DCI when all PXSCHs are sorted in ascending order of the MCS index (e.g., when S=1 for all PXSCHs). In many cases, the STI bitmap may be unnecessary, especially if the target BLER is low, resulting in a low retransmission probability. Therefore, an Unsorted Transmission Indicator (UTI) may be added to the DCI to indicate whether there is an unsorted transmission or not.

For example, UTI=1 may indicate the presence of PXSCHs that are not sorted in ascending order of the MCS index. In this case, the DCI may include an STI bitmap. On the other hand, UTI=0 may indicate that there are no PXSCHs that are not sorted in ascending order of the MCS index. That is, all PXSCHs are sorted in ascending order of the MCS index, in which case the DCI does not need to include an STI bitmap. If UTI=0, the UE may assume that all PXSCHs are transmitted sorted in ascending order of MCS index and calculate the MCS index of each PXSCH.

17 FIG. Referring to, in Case A, the DCI includes UTI=1. This means that there are PXSCHs that are not sorted in ascending order of the MCS index, so the DCI additionally includes the STI bitmap. The UE may use Equation 1 and Equation 2 described above to calculate the MCS index of each PXSCH.

11 FIG. 17 FIG. 11 FIG. 17 FIG. REF 1 1 On the other hand, in Case B, the DCI includes UTI=0. This means that there are no PXSCHs that are not sorted in ascending order of the MCS index, i.e., all PXSCHs are sorted in ascending order of the MCS index. Therefore, the DCI does not include the STI bitmap, which prevents the DCI from growing in size. The UE may assume that all PXSCHs are transmitted sorted in ascending order of the MCS index and calculate the MCS index of each PXSCH. For example, the UE may calculate the MCS index of each PXSCH using the method described with reference to. In this case, the reference MCS index Iinmay correspond to the MCS index Iof the first PXSCH in, and the MCS index difference value Oof the first PXSCH inmay not be transmitted.

16 FIG. 17 FIG. Meanwhile, depending on the QoS characteristics of the data stream, it may or may not be efficient to use UTI. For example, it may be desirable not to use UTI if the STI bitmap should be included in most cases. The base station may select/configure the optimal DCI transmission method by enabling or disabling UTI by e.g., RRC messages, etc. If UTI is disabled, the DCI may always include an STI bitmap, as described in. If UTI is enabled, the value of UTI may determine whether the STI bitmap is transmitted or not, as described in.

A second implementation of the present disclosure provides a method for efficiently allocating a limited number of bits of a DCI between sorted transmissions and unsorted transmissions.

REF REF The MCS index may include both modulation order and code rate information, or it may include only modulation order. For example, if the NR supports Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), 16QAM, and 64QAM as modulation orders, MCS indices 0 through 27 include both modulation order and code rate information, which may be used for both initial transmission and retransmission. MCS indices 28-31, on the other hand, include only modulation order information, which may only be used for retransmission. This is described in Table 5 above. Depending on whether the reference MCS index Iis one of these two types, the range of the difference between the MCS index of each PXSCH and the reference MCS index Imay vary. If the reference MCS index includes both modulation order and encoding rate information (e.g., MCS index 0 to 27), the range of variation in the difference value may be relatively large. On the other hand, if the reference MCS index includes only modulation order information (e.g., MCS index 28-31), the range of variation in the difference value may be relatively small.

Also, the range of the difference between the MCS index of sorted transmissions and the MCS index of unsorted transmissions may be different. Because the MCS index of sorted transmissions is transmitted only as the difference from the MCS index of the immediately preceding transmission, the range of the difference may be relatively small. On the other hand, the MCS index of unsorted transmissions is transmitted as the difference from the reference MCS index, not the MCS index of the immediately preceding transmission, so the range of difference values may be relatively large. In other words, in sorted transmissions, the change in the total MCS index is the difference between the MCS index of the last PXSCH and the reference MCS index, which is equal to the accumulation of the MCS index difference values of each PXSCH. In contrast, in unsorted transmissions, the change in the MCS index is likely to be similar to the total MCS index change in the initial transmission. In addition, in sorted transmissions, because data with the same MCS may be divided into multiple PXSCHs and transmitted, the amount of change in the MCS index is likely to be less than the accumulation of the maximum value that each difference value may have. Therefore, it may be efficient to allocate the number of bits required to transfer the MCS index difference value differently for sorted and unsorted transmissions.

If the number of bits required to transmit MCS index difference values are allocated differently for sorted and unsorted transmissions, the number of bits required may vary significantly depending on the number of sorted and unsorted transmissions. If the number of bits required to transmit MCS index difference values is variable, the size of the DCI may be fixed based on the largest case or variable. In the former case, the DCI size may be excessively large, and in the latter case, the UE may need to perform decoding for all possible DCI sizes, which increases the complexity and power consumption of the UE. Therefore, there is a need for a method for appropriately allocating and utilizing the limited size of DCI bits based on the number of sorted and unsorted transmissions.

18 FIG. shows an example of a DCI for multiple TTI scheduling to which the second implementation of the present disclosure is applied.

18 FIG. shows an example of constructing a DCI that includes MCS and HARQ information in multiple TTI scheduling. When the number of PXSCHs determined by the TDRA is NPXSCH, the size of each piece of information included in the DCI may be configured as follows.

(1) MCS Information

REF REF MCS MCS MCS (I): Indicates the reference MCS index. The number of bits for I, N, may be determined by the size of the MCS table. For example, in NR, Nmay be 5. UTI UTI: Unsorted Transmission Indicator, where the number of bits for the UTI, N, is 0 if UTI is disabled and 1 if it is enabled. STIs STI: Sorted Transmission indicator, where the total number of bits for the STI, N, is 0 if UTI is enabled and its value is 0 (i.e., UTI is enabled but there are no unsorted transmissions) and NPXSCH otherwise. REF Total-Offset-Bits MCS Index Offset: The difference between the MCS index of each PXSCH and the reference MCS index I, consisting of NPXSCH differences. The number of bits of the MCS index offset, N, may be expressed as Equation 3.

Total-Offset-Bits REF In other words, the number of bits of MCS index offset Nis the total number of MCS information bits minus the number of bits of MCS (I), UTI, and STI.

(2) HARQ information

HARQ-PN HARQ-PN HARQ PN: HARQ process number of the first PXSCH, the number of bits Nis determined by the number of HARQ processes in operation. For example, in NR, Nmay be 4. PXSCH NDI: NDI for each PXSCH, consisting of Nbits. PXSCH RV RV RVs: RV for each PXSCH, consisting of NNbits when the number of bits for the RV is the N.

MCS-HARQ-Information-Bits Total-Offset-Bits When the number of bits required to transmit MCS information and HARQ information, N, is fixed so that the UE can decode a DCI with one size (i.e., DCI size fixed), the number of bits of the MCS index offset, N, may be expressed as Equation 4.

Total-Offset-Bits At this time, the following two methods may be considered as a way to differentially allocate the total number of bits of the MCS index offset Nto the sorted transmissions (hereinafter referred to as Type-1) and the unsorted transmissions (hereinafter referred to as Type-2).

(1) First Method

Type-1-Offset-Bits Type-2-Offset-Bits Total-Offset-Bits Type-1-Offset-Bits Type-2-Offset-Bits In the first method, the number of bits for each offset value of the sorted transmissions Nand the number of bits for each offset value of the unsorted transmissions Nmay be set to a fixed value. The base station may schedule such that the sum of the total number of bits of MCS index offsets does not exceed N. The base station may inform the UE of the fixed and set Nand Nvia e.g., RRC messages.

PXSCH Type-1 Type-2 Type-1 Type-2 The base station may determine the Nand Nand Nto satisfy Equation 5, where the number of sorted transmission PXSCHs is called Nand the number of unsorted transmission PXSCHs is called N.

(2) Method 2

Type-1-Offset-Bits Type-2-Offset-Bits PXSCH Type-1 Type-2 In the second method, Nand Nmay be dynamically determined by Nand Nand N.

Type-1-Offset-Bits Type-2-Offset-Bits The relationship between Nand Nmay be expressed by Equation 6. In Equation 6, a is a value greater than 0, which may represent a proportional constant of the cumulative maximum value of the sorted transmission difference value and the maximum value of the unsorted transmission difference value. The value of a may be communicated by the base station to the UE via e.g., RRC messages.

Type-1-Offset-Bits Nwith a value of at least one bit from Equation 6 may be represented by Equation 7.

Total-Offset-Bits Type-1 Type-1-Offset-Bits Type-2 Type-2-Offset-Bits The relationship between N, Nand N, and Nand Nmay be represented by Equation 8.

Type-2-Offset-Bits type-1 Type-1 Nis the largest integer that satisfies Equation 8. The number of bits of the difference value assigned to NPXSCHs, N-Total-Offset-Bits, may be calculated by Equation 9.

Type-1-Total-Offset-Bits Type-1-1 Type-1-2 Nmay be assigned to each sorted transmission PXSCH as shown in Equations 10 through 13. Since the number of bits assigned to each PXSCH is an integer, it may not be possible to assign the same number of bits to all PXSCHs. Some (N) PXSCHs may be allocated one more bit than the rest (N) PXSCHs.

Additionally, depending on the characteristics of the service and data stream, the first transmitted PXSCH from among the sorted transmission PXSCHs may be prioritized and allocated one more bit. Alternatively, the later transmitted PXSCH may be prioritized and allocated one more bit. For example, if the transmission volume of a data stream requiring a similarly low MCS is greater than the transmission volume of a data stream requiring a higher MCS, it may be efficient to prioritize one more bit for the later transmitted PXSCH because it is more likely to be followed by a larger MCS index difference. If the earlier transmitted PXSCH is prioritized by one more bit, then Type-1-1 in Equation 10 is the earlier transmitted PXSCH and Type-1-2 in Equation 11 is the later transmitted PXSCH. Conversely, if one more bit is prioritized for the later transmitted PXSCH, then Type-1-2 in Equation 11 is the earlier transmitted PXSCH and Type-1-1 in Equation 10 is the later transmitted PXSCH. The base station may set whether the earlier transmitted PXSCH or the later transmitted PXSCH is allocated one more bit in priority via, e.g., an RRC message.

The maximum value of the MCS index difference value is determined by the number of bits, which may be less than the difference value of the MCS index to be transmitted. If the difference value of the MCS index to be transmitted is larger than the maximum value of the MCS index difference value that can be transmitted to the DCI, the base station may set the MCS index difference value to be transmitted via the DCI to the maximum value that can be transmitted. In this case, the actual MCS index transmitted will be lower than the MCS index that should be transmitted, which may reduce the transmission efficiency somewhat, but it will still satisfy the QoS required for the data stream.

REF XSCH REQ,n XSCH n XSCH MAX,n n XSCH If the reference MCS index transmitted via the DCI is I, the MCS index required for the n-th Pis I, the sorted transmission indicator of the n-th Pis S(0 or 1), and the maximum value of the MCS index difference value of the n-th Pwhich can be transmitted via the DCI is O(>0), the base station may transmit the MCS index O(≥0) of the n-th Pas follows.

n n XSCH n XSCH n n (1) If the reference MCS index includes both modulation order and coding rate information (e.g., MCS index 0 to 27), O(an integer ≥0) may be calculated by Equation 14 and Equation 15. Equation 14 may represent the case where S=0 of the n-th P, and Equation 15 may represent the case where S=1 of the n-th P. S=0 may represent unsorted transmissions, and S=1 may represent sorted transmissions.

n (2) When the reference MCS index includes only modulation order information, O(an integer ≥0) may be calculated by Equation 14.

REF REF MCS MCS MCS (I): Indicates the reference MCS index. The number of bits for I, N, may be determined by the size of the MCS table. For example, in NR, Nmay be 5. UTI UTI: Unsorted Transmission Indicator, the number of bits for the UTI, N, is 0 if UTI is disabled and 1 if it is enabled. STIs PXSCH PXSCH STI: Sorted Transmission Indicator, the number of bits in the total STI, N, is 0 if UTI is enabled and its value is 0 (i.e., UTI is enabled but there are no unsorted transmissions) and Notherwise. The Nmay be obtained from the TDRA. MCS index offset for each PXSCH: The remaining DCI bits by subtracting the number of bits of the reference MCS index, the number of bits of the UTI, and the number of bits of the STI for each PXSCH from the total number of bits of MCS information are allocated to each PXSCH. According to the first and second implementations of the present disclosure, the MCI information included in the DCI in multiple TTI scheduling may be organized as follows.

MCS-HARQ-Information-Bits A total number of DCI bits to transmit MCS and HARQ information N Whether UTI is used A method for determining the number of bits for the MCS index difference value for sorted transmission and unsorted transmission PXSCHs: Method 1 or 2 Type-1-Offset-Bits Type-2-Offset-Bits If Method 1 is used to determine the number of bits for the MCS index difference value for sorted transmission and unsorted transmission PXSCHs: Number of bits for the sorted transmission MCS index difference value Nand number of bits for the unsorted transmission MCS index difference value N If Method 2 is used to determine the number of bits for the MCS index difference value for sorted transmission and unsorted transmission PXSCHs: a (proportional constant of the maximum cumulative MCS index difference value of the sorted transmission PXSCH and the maximum value of the MCS index difference value of the unsorted transmission PXSCH if the reference MCS index contains both modulation order and coding rate information) and the bit allocation priority of the sorted transmission PXSCH (indicates whether the PXSCH transmitted first or later has higher priority). In addition, according to the first and second implementations of the present disclosure, the following information may be configured for multiple TTI scheduling. The information may be specified by the specification or may be communicated from the base station to the UE via e.g., RRC messages.

19 FIG. shows an example of a procedure for obtaining an MCS index of each PXSCH from a DCI received by a UE, to which implementations of the present disclosure are applied.

1900 In step S, the UE obtains NPXSCH, the number of PXSCHs, from the TDRA included in the DCI.

1901 In step S, the UE determines whether the DCI includes a UTI.

1910 If the DCI includes a UTI, in step S, the UE decodes the UTI.

1911 In step S, the UE checks whether the value of the UTI is 1 or 0.

1912 If UTI=0, in step S, the UE configures/considers that all PXSCH transmissions are sorted transmissions.

1920 If UTI=1 and/or the DCI does not include a UTI, in step S, the UE decodes the STI bitmap.

1921 In step S, the UE configures/considers each PXSCH as a sorted transmission or an unsorted transmission based on the STI of each PXSCH.

1930 In step S, the UE determines whether the bit allocation method of the MCS index difference value is method 1 or method 2 as described above.

1931 If the bit allocation method of the MCS index difference value is method 1, in step S, the UE determines the number of bits of the MCS index difference value for each PXSCH. The number of bits of the MCS index difference value for each PXSCH may be specified in the specification or may be configured, e.g., in an RRC message transmitted by the base station.

1932 If the bit allocation method of the MCS index difference value is method 2, in step S, the UE calculates the number of bits of the MCS index difference value for each PXSCH.

1940 In step S, the UE decodes the MCS index difference value for each PXSCH.

1950 In step S, the UE calculates the MCS index for each PXSCH.

The present disclosure can have various advantageous effects.

For example, in multiple TTI scheduling, where multiple PXSCHs are scheduled with a single DCI, data can be transmitted using different MCSs for each PXSCH while minimizing the increase in size of the DCI.

For example, when multiple data streams with different target BLERs are scheduled with one DCI and transmitted, the frequency transmission efficiency can be increased and the power consumption of the UE can be lowered while satisfying the data stream-specific QoS.

Advantageous effects which can be obtained through specific embodiments of the present disclosure are not limited to the advantageous effects listed above. For example, there may be a variety of technical effects that a person having ordinary skill in the related art can understand and/or derive from the present disclosure. Accordingly, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that may be understood or derived from the technical features of the present disclosure.

Claims in the present disclosure can be combined in a various way. For instance, technical features in method claims of the present disclosure can be combined to be implemented or performed in an apparatus, and technical features in apparatus claims can be combined to be implemented or performed in a method. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in an apparatus. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in a method. Other implementations are within the scope of the following claims.